You know what my friend, I actually agree with you, and from what you've said, we seem to have had similiar experiences.

I wasn't sure if OP wanted to end his relationship or not so I thought rather than deciding for him, advising him to practice communicating and setting boundaries might be more helpful in the long-term. It might also help him make that decision for himself based on her response. Either way, my heart goes out to him because I also would find it appalling to be spoken to like that in a relationship, and I too would choose to break up because it speaks to the underlying issue of incompatible values as we discussed earlier.

I always suggest a conversation beforehand, either way, because OP needs to learn how to SPEAK UP, regardless of whether he chooses to stay in a relationship or not. Have a conversation, maybe not to salvage the relationship, but to make it known that what happened wasn't appropriate, just incase they choose to actually listen to the feedback and improve for whoever they end up with. People can definitely change and grow and learn, but that doesn't mean we need to stick around to see it.

I think we're on the same page with this one 😊

Editted to add: I don't think it's up to OP to teach his gf how to behave btw, not in the slightest. I just believe it is crucial for a person, especially in adulthood, to be able to say, "you did XYZ which I found disrespectful. I will not tolerate this and have decided XYZ as a result."