[cynical_sheet]

'Troll' seems to be a name for someone whose opinions you disagree with. Since internet is a huge echo chamber, any sign of contrary opinion is seen as trolling (like 'Are you serious?' or 'This guy must be trolling'). Calling someone a 'troll' is a psychological defense mechanism where a person is trying to use a label (i.e. do ad hominem) instead of rethinking their beliefs, which is hard to do.

[noobermin]

An overused meme: "Trolling used to mean something" specifically, it meant baiting people into flamewars/arguments that the troll didn't necessarily agree with, but which provoked a response that gave them their fun. If we trust the author's opinion of their boyfriend, then he is probably doing just that, using hyperbole to troll people online.