It could be considered a rule 5 violation easily, for potentially being both inflammatory and low-effort, though rule 5 really isn't a good rule to begin with. It is too vague. Why it exists I can only imagine. I could interpret hundreds of not-so-recent posts as violating some part or all of rule 5. I could waste time reporting many of them and it's doubtful any would be deleted. That's my experience, anyway, but I also don't make many reports besides on actual spam.
There are cases where it's probably warranted to call a post out as originating from a routinely obnoxious user, but I can say this is often not what's happening as I have also been accused of being an array of boogeymen when I have never attentionwhored here.