Would be nice if others would report them too, because there are kids on BlueSky and they don't need to see their uncles/aunts or neighbors sticking their butt into a camera.
I'm not into comics or manga, but surely they're art?
And I mean this quite aside from the annoyance of seeing them when you don't want to. I'm not saying you should have to see them. It just doesn't seem right to imply that you shouldn't have to see them because they're not art.
Colloquially when people say Art they mean what they see in a museum, not what they can buy in the corner store. When I subscribe to a generic Art category I want to see artists showing techniques, cool paintings, breakdowns of how marble was carved, and most certainly not catgirl uwu. I might be interested in a post about how comics are made (high effort, interesting content), but I am not interested in a picture from issue #346 (low effort fandom attraction).
I think the root issue is that a generic category is inherently not opinionated.
If there's a "fine art" category, that would probably be more in line with what you're looking for.
But not many artists these days work in marble or do museum-style paintings because there's not much of a market for it and they have to eat. So working artists are not likely to generate that sort of content in large numbers.