I doubt any other course on this site will teach this (not even swedish, the language of many many internet trolls). super useful
It's like in English; it might sound strange to someone who didn't grow up with Internet culture, but anyone below 40 is likely to be familiar with the term.
I try not to annoy them but I always do for some reason.
Is the Norwegian as ambiguous as the English translation?
No, you'd have to rewrite it as "Jeg hater å irritere nettroll." for your meaning.