The problem is when the lines blur on these. Often statements are not with the intention of provocation but can end up that way.
As an example, allow me to talk about a rider I have some "known" opinions about: Sepp Kuss. My dislike of Kuss the racer, and now the media goody-two-shoes presentation of him, is genuine. Sometimes during racing events, I may get a bit heated and have lost my cool on a few occasions. However, I also know that I do this, and away from racing scenarios I often make jokes about that dislike and lack of self-control, either by way of self-referential humour or by way of exaggerating the dislike to comical proportions. That falls in your definition above because I'm deliberately exaggerating my opinions, but is not intended as trolling, if anything I'm making a joke at my own expense. People who read these posts seriously after seeing the in-race anger and frustration probably perceive this as spoiling for a rumble, a blind, incandescent hatred, rather than exaggeration for comic effect. But then people who read those comments as self-referential humour and not intended seriously may then look at the in-race posts and think I'm trolling Kuss fans rather than expressing genuine emotions when I cheer him getting dropped or throw a tantrum about him succeeding.
Now, while a lot of the out of race posts are usually intended as humorous, the in-race ones usually are not, and that creates an ambiguity, even before we get to the simple fact that I'm no professional comedian, and what I find funny and a line of humour to continue, others may think I'm just trolling away, take for example ManicJack thinking somehow that my conflation of Riley Sheehan the cyclist with Riley Sheahan the hockey player was somehow intended as an insult and perceived this, along with my dislike of Sepp Kuss, to be evidence of some kind of anti-American sentiment (perhaps I shouldn't have done so much commentary on CIA intervention in Latin America in the Race Design Thread, for my part, but it certainly feels like there's a few subsets of posters who are extremely hypersensitive about any criticism of their countrymen, and it's far from being just Americans before that gets jumped on) worthy of reporting as trolling, rather than just an aside that I found amusing but clearly others didn't.