Well, that's just trolling, though, isn't it? And you're the target, because you react.
Right, it's not necessarily negative because it tends to create adopted terminology. The problem is seeing something that seems to be a common element and creating an unfounded image of everyone that shares that at any given instant. One assumes that someone who questions the presence of lolicon hentai is a 15 year-old Christian who only watches Naruto, then prods them with this until something inflammatory enough (false or true, doesn't matter) strikes a nerve. Then they react in kind and everyone's pissed off, not really because of anything that was said or posted, but by the image of the poster you imposed yourself.
Not taking into account the numerous other potential causes, including but not limited to the possibilities that they are Anonymous of Spain or someone else using reverse psychology or just a regular troll.
Not every battle has to be a fight.