My sister thinks I’m not happy for her engagement. I think he’s a bad person.

My sister recently got engaged to a man she has been seeing for about a year and a half. They got together before her divorce was finalized but obviously I’m gonna support her however she chooses to heal. When they initially started dating, I started to notice my sister would change a lot of her morals for him. For example, she is a very left leaning feminist. But she would listen to him openly talk about other women in a very sexual manner. And more often than not, a degrading way. She also thinks it’s charming that he essentially bullies any person he’s around. He’s the type of person that tries to pick out flaws in everything someone says and make them feel dumb. My sister has never found that behavior to be acceptable until now. Recently, we were on the phone and he pushed his way into our conversation about stay at home moms. I’m not gonna get into the exact discussion but he basically said stay at home moms are pointless and that any woman who has a separate bank account from their partner is preparing for divorce. Which is wild because my sister talks about how she wants to be a stay home mom. Today, she was talking about how much she loves him and how he’s the best man and I couldn’t help myself. I let a few negative comments about him slip and now she thinks I’m not happy for her. I feel really bad. We’ve had a few blow up fights about him before.(we used to live together and he tried to get her to abandon our lease). But I feel like we’ve been in such a good place. And I don’t wanna lose that. What do I do?