As the previous poster stated we learn to "mask" and can get through society based on behaviors we have learned to mimic from others. We mask because society will not tolerate us otherwise. I can't just vocally stim in the grocery store without causing a scene. I've learned not to do that to have a generally "normal" experience. But I have the urge to beat box the whole way through because that's a soothing activity for me when I am experiencing anxiety and going to the store is a very anxiety provoking experience.

IMO I'd read a bit more up on the autistic spectrum. Further, I'd really recommend you never armchair diagnose anybody because that's extremely harmful. A lot of us have been told "we aren't autistic" or "that doesn't look like autism" and that specifically can cause tons of consternation for people like myself and OP as we try to figure out our way through life.