Would you tell your male best friend how you feel about his girlfriend or be too worried how that will look

I have a best friend of 10 years who is a male and he has a girlfriend who he's been with for 3 years and I feel like the relationship is so toxic but I also don't want to come off at that pick me girl best friend. I didn't like her in the beginning because she's severely fetishizes black men. She's white. My best friend is black and she is always talks about how she likes black dick. She loves porn that is from I think the site is literally called BLACKED where people get "blacked" what is just people being fucked by black men. She is always talking about only dating black men because she loves black dick which I can tell makes him uncomfortable. There's having a preference and then there's just sexualizing a race. She will also drop the N word when she's mad at him and I've watched her hit him in the face several times. For his 22nd birthday and she drunk and threw glass at him and called him a stupid fuck N word. We all just kind of stand to the side and not say anything. They broke up for a short period and it was because she had threatened to call the police and tell them he hit her when he tried to leave, which he didn't but then of course he gets back with her. My brother looked her up and she has several domestic violence charges. From her past boyfriends. I want to just talk to him but I don't know what to say when it's a man in an abusive relationship and don't want to come off as a pick me.