AITA for not stopping my teenage sons gf from kissing him?

My (50) son (17) recently got into a car accident with a drunk driver. I am very thankful that he is alive, obviously, but his car is totaled (the drunk driver was driving a pickup, and my son drives a small old convertible, most likely the reason for the amount of damage) and he is fairly injured, ie multiple breaks, lots of stitches, etc, and is currently recovering. This all occurred last week on saturday, the night of the accident.

My family (my wifr,45 and daughter,14) got there I want to say an hour before his girlfriend? When she came in she ran to him in his hospital bed and started hugging and kissing him (mainly lips but other places on his face too). She stayed for most of the night, checking up on him and being supportive, and I was happy that my son and his gf had such a good relationship. As we were driving home that night my wife said she was upset I didn’t say anything to my sons gf. I asked why I would have as she was being a good partner

My wife said that it felt weird seeing that, especially Infront of his family. I said that he was going off to college regardless, and that she was being a really nice partner, and that night showed us how much she truly cared for him. She rushed off of work to get there and was still wearing her work clothes as she got there. My wife started getting angrier and said that she thought it was gross and that I should just ask her to leave sometime. I told her that I’m, not telling my hospitalized son that I’m taking away something that clearly makes him happy. She told me it was gross and that I needed to put a stop to it. I told her she was worrying about the wrong thing and that anything that brought our son comfort was good (my brother had taken my daughter home before this, she didn’t hear us arguing). She told me I needed to step up and do my job and I’ve kept thinking about it, and I have started to keep thinking about it and thinking that I am in the wrong?