AITA for telling my girlfriend it was gross for her to eat out of a shared food container using the skewer from inside of a corn dog we just ate?

Today me (21M) and my girlfriend (21F) cooked a Korean corn dog in the air fryer and shared it. After we were done what was left was a blunt, wooden skewer covered in a thin layer of mozzarella cheese, saliva, and ketchup (she wants me to specify that it was not dripping in saliva but mildly saturated). My girlfriend then remarked she was still hungry and got up to go get a Tupperware full of precooked chicken I made for us to use in whatever meals throughout the week. As I walked past to throw the skewer away she said "wait don’t throw that away give it to me" and proceeded to impale (not very effectively) several pieces of shredded chicken (straight through one of them into the bottom of the Tupperware, where I maintain that some chicken still remained, she disagrees). She then proceeded to eat this chicken (again not very effectively) using the skewer. When I was grossed out by this she was offended, and shocked that my takeaway was that this was unsanitary and that I did not appreciate her ingenuity.

Girlfriend here… we had just had a slight argument about him licking my back and me not liking it. He maintains that that was fine lol. I think this is all ok because I made an effort not to stab each and every chicken in the container, and even if there was slight touching, why does it matter when we swap spit on the reg.