My Best Friend’s Boyfriend is an Asshole! HELP

My best friend (well call her J) and her boyfriend (well call him K) have been together for a few years now and they’ve talked about marriage and she 100% knows he the one! I haven’t really hung out with him before the only time I would see him was when he was tagging along with her and our mutual friends so I didn’t really know much about him but based off of what she told me he’s wonderful.

Recently I started following him on Instagram and I started learning A LOT about him. Let me give u some really fast background J is Asian and she was adopted and brought to the states when she little and K is 100% white like his family came over on the mayflower kinda white. Anyway, I started to learn he is EXTREMELY political, sexist, homophobic, and racist! Apparently he thinks that America should close their boarder and no body should emigrated here (even tho his gf did). He thinks being gay is a mental disease and actively tries to make friends with gay people to try to “convert them”. (It’s never worked but if they’re dating someone then he sabotages their relationship so that they break up) And that women are paid too much and the wage gap isn’t real. FYI this is only the top of the ice berg he loves to go into more and more detail.

What’s driving me crazy is that I SO badly want to argue it but I don’t want to hurt their relationship bc I respect my best friend! She doesn’t have Insta so she doesn’t see how far he goes and I try to show her but she’s so in love with him she doesn’t wanna believe it! I’m also Asian/Latina, Bi, and a female so pretty much everything he says offends me! Oh and did I mention he totally hates me! He always tell J that she’s not allowed to hang out with me and that’s when she’s pulled back to reality and yells at him but he puts so many restrictions on her and she has no clue!!!!

I’m sorry this was a huge rant but he’s actually driving me insane and I’ve never known someone who loves to take people. Do any of you lovely ladies have any advise for me bc I love her and she’s my best friend and I want the best for her that’s why I don’t want to leave? Thank you!❤️