I tell you what I hate - being totally outclassed in an intelligent conversation with my gf - in front of people.
I was told once "You know nothing about anything", In front of my friends. I wont lie, I felt very much like picking up a chick in a bar and having my way.
Just dump her, seriously.
Things are going to get much worse after you marry her... if youÂ´re planning to do so.