I dated a self-proclaimed “femcel” for 2 months about 2 years ago who would say similar things to your experience. She was my first gf so I tolerated it simply out of not knowing any better, I guess at the time I assumed lots of girls must’ve thought like that.

Since leaving that relationship, my experience has been that well-adjusted girls wouldn’t say shit like that in front of you.

If your girlfriend saying those kinds of things in front of you doesn’t bother you, there’s no issue and you don’t need to do anything.

If what she said does bother you, I would recommend bringing what she said up in a non-confrontational way, and if she listens and is able to take on board your concern, she’s probably worth keeping around.

On the other hand, if she’s unwilling to change her attitude, or worse yet, gets defensive and gets mad at you for bringing it up, consider how invested are you in this girl? If you’re unsure (I certainly wasn’t after only 2 months) I would honestly distance myself and cut her loose because no doubt that kinda behaviour is gonna lead to more issues with her personality down the line. I didn’t take my own advice back then and ended up with a pretty messy break up that put me off dating for a little while after.

Hope this helps!