social norms have reasons as well. you cant just say “because social norms exist” and expect someone to accept that answer as a reason. its basically the same as saying “because everyone says so”. so why dont you explain why the particular social norm is one in the first place. if you dont know maybe you need to find out before you try to enforce it on others.

also as an autistic person you shouldn’t be encouraging people to mask. that shit is incredibly damaging to people. i masked for most of my life and what people dont see is that i was basically just surviving that whole time. i developed an incredible amount of anxiety, to the point where i couldnt really function in society for more than a few hours at a time before i had to isolate for a day or two to recover. i wore the mask so often for so long i didnt even know who i really was anymore. i didnt start to live until a few years ago when i started making a concerted effort to take off the mask and be myself. and you know what, people fucking accepted me way more than they ever did when i was being fucking fake all the time for the sake of appearances. you might mean well telling your son and all the autists who will see your comment to mask to get by, but all youre doing is fucking hurting them and you need to stop. masking isnt for us, its for you.