they could post fucking macaroni art of vaginas under the frostiron tag and that's THEIR BUSINESS

Well, that one actually would be technically against the Tumblr rules unless they've changed recently; they made a big post a while back about how they don't (explicitly, at least) allow people to tag with random unrelated stuff all willy-nilly. It doesn't seem to be something that's really policed, of course, and it can be a challenge to sort out what does and what doesn't belong in a tag, et cetera, et cetera... so I think it mostly just keeps happening anyway.

I still reserve my right to call folks who put all their hate in fandom tags just to annoy other fans dicks, though. Whether or not I tag it with #dicks...