Most Helpful Guy
Parents often want to blame someone, someone else if their child does something they think is bad. Kid uses foul language: "They learn those bad words at school". Kid gets arrested for shoplifting: "Kid has been hanging out with a bad crowd." Kid's grades are pathetic: "Lousy teacher, that why."
But you ask if you should break up with her. I think you should not. If the two of you stay together, her parents may come around that you did not actually "ruin their family".
I realize you want them to like you, but unless you are planning to live with them, ... ummm... I mean you are only dating your g/f aren't you? Not her whole family.
Most Helpful Girl
No, you should try to know them better and even if they really do not want to get to know you, you can always ignore them and have fun with your girlfriend as long as she doesn't mind