What do we call a person who constantly demotivates others?
For context: someone who thinks he is so brilliant in English, keeps discouraging me about the questions/answers I post.
FTD inclined to judge too severely; "hypercritical of colloquial speech"; "the overcritical teacher can discourage originality" also Excessively and unreasonably critical, esp. of small faults.
M.W says: criticizing other people or things too strongly or too often
A person who is hypercritical of everything one does, says, or writes can be extremely disheartening and demotivating. Think of a hypercritical parent, partner, teacher or manager whose exacting and severe behaviour can actively discourage initiative and creativity in their listeners.
dismotivator & demotivator n
dictionary.reference.com lists demotivator as a noun.
dismotivator seems to be preferred in academic writing, esp., with reference to Frederick I Herzberg's motivation-hygiene theory (Two-factor Theory).
Word processors may flag the word, though, as many dictionaries stop at demotivate.
Plenty of use case results on Google: