Last night we got into a fight about chores, same old shit but waking up this morning we were okay.

This morning, I woke up with a pain in my ring finger joint on my right (dominant) hand. I sometimes do get joint pain in this hand but not the fingers, so I tell my boyfriend who was getting ready for work. He stops what he's doing and takes my hand and motions like he's going to pull my joint (while saying "Okay now I'm going to pull your finger and...") so I yank my hand away because this is something he knows I don't like, and something I think might hurt my hand as he isn't a doctor.

He got really pissed and took this personally. Angry for the rest of the morning and left without saying goodbye and I love you etc. He said he was angry because I "cut him off and didn't let him finish speaking" by yanking my hand away and "not trusting him". I told him it wasn't personal and that I wouldn't trust anyone but a doctor with my hand- he didn't care and remained pissed off.

I don't really understand why he's upset or if what I did was wrong. I don't think other people are supposed to control what happens to my body, and I think it's okay to say no and pull when I don't want something done to me. 

Am I lacking perspective? AITA?