This guy posted a link to my profile on Twitter, could you tell me what he wants to say?
I think BoltClock is pointing out that it's kind of a strange thing to say. For other readers, this is your profile text reposted:
When you say "typist", it means the action of actually typing -- pushing the keys that make the words come out on the screen. The only way someone becomes an advanced typist is by being a faster typist. This is because the word "typist" used to refer to a clerk or secretary who was paid to operate a mechanical typewriter. For example, you don't be a typist by knowing C++, just as you don't know C++ by being a typist. Being a typist means you can type quickly, while knowing C++ means you can program in that language. (Granted, any good C++ programmer is also going to know how to type, but that doesn't mean you can't know the language and still be a hunt-and-peck person)\
What you probably want is "Advanced programmer", because "programmer" specifically indicates a computer operator who knows one or more programming languages, which seems to be the message you want to convey with your list of languages.
Your Stack Overflow profile currently says:
Your Stack Overflow profile used to say:
He's pointing out that an advanced typist should know how to type, spell and capitalise properly. It should really be:
In fact, it's usual only to mention your typing skills in natural languages, and only if you really mean the physical skill of typing at a keyboard. It might be that you want to say your an advanced speaker of these languages. And for programming languages, you'd more likely talk about your programming skills.