What's with people accusing you of "nice guy" "fedora" shit when you complain about a girl dating an asshole?

A friend of mine started dating this guy who I've gotten into a couple altercations with in the past. The guy's a complete, rude prick; and the few times I've encountered him were always aggressive and ugly.

Now my friend has been in a relationship with him for a few months this week. She's one of the sweetest, smartest, and friendliest people I've ever met. So it's really heartrending to see someone like her involved with such a dickhead who does not, in any sense of the word, deserve her.

But whenever I make that known, I just get accused of being those one "nice guys" who complain about girls only going for jerks; and get the usual "you're only pretending to be nice just to get into [her] pants" crap and what not. Which is such horse shit, and I've never had any of this thrown at me before in my life.

What's worse is she does this whenever I try to go to her about him. She claims that my description of him doesn't even sound like the same person. And, again, also accuses me of being a "nice guy" "fedora" shit. When really the guy is just a cunt, and I honestly wish for him not to be anywhere near her. But she won't, neither does anyone else, hear me out on this.