In British English there is a common colloquialism:
"All the gear, no idea"
It describes your requirements perfectly: novices who splash out on expensive equipment but who lack the aptitude to use it properly or even to perform satisfactorily in the subject endeavour.
Unfortunately, I can't find a reputable reference work to back up my claim but, ...
A trend-setter or trendsetter:
someone who starts a trend, or makes one more popular
The other answers on this page have a couple other fine suggestions — and a thesaurus lookup turns up more suggestions still —, but be aware that some of them require additional qualification. For example, it's typically "a harbinger of something", or "a ...
Lately a favorite of mine while describing the amount of small finishing work left on our house is
Death of/by a thousand cuts (UsingEnglish.com)
If something is suffering the death of a thousand cuts, or death by a thousand cuts, lots of small bad things are happening, none of which are fatal in themselves, but which add up to a slow and painful demise....
A curmudgeon is someone who is bad-tempered and disagreeable - so curmudgeonly?
A contrarian is someone who takes an opposing view, especially for the sake of being difficult, contentious or in opposition to the generally held view. This could also be used as an adjective.
A troll is, in a certain context, someone who says something deliberately for the ...
If you want to put a positive spin on it without straying too far from the sound, try rep-hound.
1.1 [with modifier] A person who avidly pursues something:
'he has a reputation as a publicity hound'
(see Oxford Dictionaries: hound)
nouveau riche (this means someone who recently became rich and thus lacking in taste)
a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class
not easily upset or confused, especially in a crisis; imperturbable.
I like this word better than imperturbable for the idea of being cool and collected, even in the face of intentional attempts to embarrass or harass.
Sanctimonious will do.
showing disapproval): used for describing someone who tries to show that they have better moral or religious principles than other people
"I was aware even as I spoke how sanctimonious I sounded."
Synonyms and related words
describing arrogant and over-confident people or ...
You could also consider jobsworth.
Wikipedia's entry is illuminating:
"Jobsworth" is a British colloquial word derived from the phrase "I can't do that, it's more than my job's worth", meaning taking the initiative and performing an action that is beyond what the person feels is in their job description.
In my experience, it has two overlapping meanings:...
I'd describe someone as antagonistic if they are the type of person that thrives on disagreement and conflict for its own sake. These are the type of people who will start arguments for the sole purpose of creating a tense, adversarial atmosphere.
Why not rep-junkie. Oxford Online defines junkie as
[WITH MODIFIER] A person with a compulsive habit or obsessive dependency on something:
A Google search shows some minimal usage (sometimes as repjunkie), but ngram does not.
Obviously, you could use the longer form reputation junkie, but it lacks the punch.
Is there a specific word for that?
Yes, yes there is.
a vulgar person, especially one whose vulgarity is the more conspicuous because of wealth, prominence, or pretensions to good breeding.
a person who surrenders easily or is subject to defeatism.
defeatism: the attitude, policy, or conduct of a person who admits, expects, or no longer resists defeat, as because of a conviction that further struggle or effort is futile; pessimistic resignation.
is considered beyond reproach
beyond reproach Blameless, faultless, as in Jean's conduct at school is beyond reproach. The phrase employs the verb to reproach in the sense of "censure or rebuke," a usage dating from the early 1500s.
— The American Heritage® Dictionary of Idioms by Christine Ammer
reproach — [...] reprochen "to rebuke, ...
In the context of video games or people who collect sets of things, the perfect word would be completionist — if it weren't for the fact that you're looking for a word with derogatory connotations.
Derogatory phrases for things related to completionism — collecting things and interest in storytelling, for example — would be
In video-game circles, the unfortunate phrase achievement whore seems to be used rather often.
Precise usage varies. Occasionally the phrase will be used for somebody who simply tries very hard to gather all achievements in a given game. More frequently, however, it is used to denote somebody who buys and plays new games purely to gather more achievements, ...
Another term might be a Poseur (Wikipedia):
Poseur (or poser) is a pejorative term, often used in the punk, heavy
metal, hip hop, and goth subcultures, or the skateboarding, surfing
and jazz communities, to describe a person who copies the dress,
speech, and/or mannerisms of a group or subculture, generally for
attaining acceptability within the ...
insensitive or hardened to criticism, reproach, rebuff, etc
It may be because I come from East Asia but this is the phrase I most often hear (the phrase also exist in Malay and I believe Mandarin).
It does have a slight negative connotation but I honestly don't believe there can be any ...
You could say the person is a stickler (sometimes clarified with for: “a stickler for the rules”, “a stickler for accuracy”, “a stickler for grammar”) if you mean they enforce rules or process that others don't.
This is similar to self-centered, but perhaps has less of a negative connotation. A person who talks about themselves a lot may simply be introverted, and socially awkward, and therefore not have a lot else to talk about. They may also try to give themselves a sense of social relevance, not realising that it is actually counter-productive.
Shirker comes close. From Dictionary.com:
a person who evades work, duty, responsibility, etc.
The term doesn't necessarily specify a particular method of avoidance, though, so your not-my-jobber would be a sub-class of shirker.
Edited to add this great little poem from a 1921 Railway Signal Engineer issue (attributed to Selected):
Affable: (from TFD)
Easy and pleasant to speak to; approachable.
From Etymonline we gain insight into the reason "Affable" might work to describe "people who are easy to talk to":
from Old French afable (14c.)
from Latin affabilis "approachable, courteous, kind,friendly,"
literally "who can be (easily) spoken to,"