I think it’s called ‘having an opinion’, or something like that. 😎

Nothing wrong with having an opionion, but allow me to put it another way.
I belong to two particular makes of car forums and to my knowledge, no one has ever joined either of them with the sole intention of criticizing those makes.

On this forum, I have almost no interest in Modern Military Aviation, so I don’t look in there.;)

There are myriad other discussions on this forum that are of no interest to me, but I would never consider posting negative comments on them for the sake of showing my displeasure or voicing an opinion that the OP wouldn’t want to hear.

IMO, if someone can’t help themselves or resist the need to post negative comments about any particular topic, having done so once, surely the best course of action is to ignore the thread in future, instead of continuing their attempts to wreck it?