Getting stared at public places for excessive stimming

So my 6'2, 290 lb 16 yr old has always flapped his hands (when excited or anxious) and has paced. It was cute and disregarded when he was a little toddler, but now at his size, age and his mini-beard, it brings a lot of negative attention when he does that a pizza buffet with people watching.

I've had a McDonald's manager tell us that he was scaring other people and asked me if I could get him out of the premises. Of course, I took care of that manager by sounding off to corporate and making a big stink about it.

How do you deal with excessive stimming for people who are not kids anymore and are in the danger of vigilante citizens calling the cops over what seems to be innocent/harmless behavior.

I flapped my hands all the time too, up until sophomore year of high school. I don't remember doing it, though, so it must have been a stim. Anyway, it stopped pretty much immediately after my mom told me not to do it (which I also don't remember).

I literally remember nothing about it so I don't know if I did it publicly or if my mom was asked to take me away or anything like that.