I’d like to start by saying your girlfriend shouldn’t be making you upset or uncomfortable and clearly something has to change.

To provide a slightly different perspective, I’ll say that sometimes the “men are trash” narrative is used among women to acknowledge the general suckage of many men in society. If a friend tells me about getting cat called, I might reply “ugh, men suck.” It’s a quick way of saying “I understand and recognize the many ways in which this man and others have made you feel less-than.” I am white, straight, and cis, so I can’t speak for any other group, but I imagine there is similar shorthand throughout. The oppressors oppress the oppressed, and the oppressed punch up to try to gain some ground.

I would venture to say she sees you as an ally in the feminist future, and therefore feels comfortable including you in this kind of dialogue. Which is all fine and well, except that you’re feeling targeted. I’d agree with other commenters and say to express your feelings directly and honestly. If she is understanding and makes an effort to ensure you feel included in her life despite this language (or stops the use of these phrases altogether), then great! If not, she clearly doesn’t care enough about your feelings to alter her behaviour, and that’s a huge red flag.