Open Question: What is protocol for customers using a credit card?

There is a swiper for customers right where i check out but the girl at the register says she will swipe it for me. Im pretty certain she is looking at my name and signature and comparing it to my ID but she wont admit it. Others (at this same store) dont even ask to swipe my card they just let me do it myself and ask to see my ID. Should I say something to this cashier cos she really insults my intelligence by doing this!