[GrumpySimon]

Yes, but calling it all "trolling" lumps it together. In the replies to your comment you can see people equating trolling to everything from slight teasing to serious harassment.

The problem with calling it all "trolling" is that it normalizes the seriously nasty things (e.g. threatening to kill someone's wife) by analogy to the less serious things ("I tease my friends all the time").

At some point, these are very different things. And they need to be treated very differently. Calling them different things (e.g. "harassment" or "hate speech" vs "trolling") helps set up that mental boundary in peoples' minds and helps them demarcate what's right and wrong.