@Karen does he say why it is?
One of the reasons it wastes his time. All he’s doing is gaming. I don’t think he likes being cold when he gets out. Plus it’s also a demand. My sons sen school made him put plastic gloves on during Covid as he refused to wash his hands so who knows.
Our 15 year old asd son is a nightmare. I have to run the bath, give him lots of warnings and timers. I’m not bothered about him washing his hair as it’s short anyway,