"It's still real to me dammit!!"
Haha, had to be the first. Just kidding.
I hear it all the time too. Whenever I think I can introduce someone to wrasslin', they watch it for 5 min. and they always tell me the same lame ass crap: "Why do you even watch something like that? You can see it's fake!". I know the pain you explained about your girlfriend. I had the exact same thing 4 years ago. I let my girlfriend watch, and she gave me that godawfull look of: "you've got to be joking!". In the beginning she commented on it and blasted it. Overtime, she knew that I liked it and she started to appreciate how much I love it. Nowadays she goes with me to house shows whenever they are here, just to cheer Cena. So, just give her time. It'll come eventually.
My opinion about those statement is: don't mind what people say about it. If you watch it and you like it, keep watching. Don't let others fool you, by turning it off whenever they say it's fake. Watch whatever damn well pleases you and not what someone else tells you to watch.