What to do about problematic behaviour from meta and excuses from my partner.

Heya, (warning: mentioning of SA)

Since June I've (24f) been dating a woman and in August we got together. She is truly wonderful but her partner is giving alot of red flags and she doesent notice them or even excuses them.

But i thought to myself that's non of my business, cause we'll it isn't. But those bad behaviours started affecting me personally and are now getting to alarming stages

What I've talked about with her:

He constantly makes remarks about my sex life with her and jokes about me and her having sex. She talked with him and it got less but didn't stop.

He makes jokes about rape and SA, talks about rape fantasies and talks like being SA'd gives you bragging rights. (I've been raped beginning of this year and she knows it.) told her it made me uncomfortable and panicky. Her answer was that's his way of coping SA, ya sure around someone he met for the first time without warning, tact or any sensibility around the topic.

EDIT: when I talked about this with her she did admit that this was not good of him and she did talk with him and since then it hasn't happend again.

Now the bad stuff I haven't brought up to her cause I don't wanna disturb others relationships:

He has made several comments that to not only me but also several friends sound like fucking pedo stuff and like psychopath shit like literally saying he's into teenagers and wierd comments about child murder. Which is even more concerning knowing he works in an environment with children. She seems to think those are all just jokes.

I wanna bring those up to her but I don't wanna be the black sheep that talks bad about my meta.

What would your advice be? Cause I have no clue what's the right thing to do.

Sorry for bad formatting and grammar

Edit: It has come to my attention that while writing this text I have deleted some stuff that was important that I forgot to re add. Did that.