well she clearly doesnt like it. doesnt mean youre going to stop doing it. just tell her that. "hey, I know you dont prefer it, but Ive been doing it long before i knew you, and its MY choice. I prefer it. now STFU!"
haaha
If you were my man, Id probably tell you its sexy for a man to have some hair on his arms/legs/chest, but i certainly wouldnt berate you if you chose to continue shaving.