Sister called me stuck up

I'm bisexual and am going through a divorce with my wife. It's been really hard so my sister has tried to pair me up with her boyfriend's best friend and told me he's cute and in a band. We've been going on a few dates. Got to know him. He's actually pansexual and talks about love and honestly seemed like such a genuine guy and I liked his music. We started posting pictures together and a girl reached out to me saying to be careful and he SA'd her 8 years ago. She sent me a link to an old YouTube channel which is supposed to have belonged to him in his early twenties and it was just him posting videos acting like a douche but also SAing people. Like one he and his friends are talking about a girl passed out drunk on his couch and saying he's going to fuck her. One were he's doing the same exact thing to a guy who looks like a teenager. It's just a videos of him bragging about having sex with extremely intoxicated and passed out people. The fact that that's on the Internet and he's not in jail i don't understand. I didn't say anything to him. I just blocked him and my sister ended up asking me about it and I showed her the YouTube and she's like "Oh yeah that's his past. He's made a lot of mistakes." My sister knows I got out of a very toxic and abusive marriage with my ex wife and she hooks me up with a guy he has a history of SAing people? My sister tried to say it was so long ago because he's in his 30's now but I think there's something severely disturbing about someone bragging about getting some from people who can't consent. Like I said the first video the girl was passed out drunk and he went to fuck her and another a guy can barely walk. I don't care if that's from his twenties he should be in jail and I don't understand how he's not. My sister said that I'm being stuck up and making her look bad and she tried to do me a favor and that we all have a past. Also this guy had been trying to get me to go out for drinks for a while and this man is not someone I would trust to get drunk with. I guess now I can't hang out with my sister and her friends since I ghosted her boyfriend's best friend and now I feel worse than before and she was supposed to make me feel better about the divorce 🫤