Anna, there are lots of people out there who understand. I think they just get hidden among the people who don't, because the people who don't make us feel so bad that sometimes they are all we see.
But
I was once one of those people who didn't understand. I do not remember ever saying anything hurtful to an individual such as yourself, but I was hurtful toward parents of kids who were quite probably on the spectrum. You see, before I had kids, I thought that parents should be able to "control" their kids. So, I was the parent who would sigh loudly and glare at the parent of the child who was screaming on the plane or misbehaving in the store. I am embarrassed by that now, and saddened for all of the parents who's days I made worse, but it's the truth of who I was.
Luckily, God blessed me with two children who opened my eyes and taught me the truth. And it left me very aware of the fact that sometimes, people are good people at heart, but they just don't know. They don't know, and maybe they can't know, because it is too far outside of their experience.
While I do not think it is your job to educate other people, I also do not think it would be wrong for you to confront their staring directly and say "I have tics due to a neurological condition. I know it looks strange to you. I find it very embarrassing but I can't help it. You could help me by just understanding that this is not something I choose and not something I can control. Thank you for understanding." If you do not use spoken language or feel uncomfortable speaking to people you don't know, you could always write it on a card. I used to have a card for my daughter when she was younger and her symptoms were more obvious. I found it to be helpful for the most part, and sometimes it even made people ask good questions, so I could tell them a little bit more about what autism is. I feel that together we made a good "ambassador" team, and I think that even if we only made one person change their view of autism, we had a success. We changed one person by taking away their ignorance and replacing it with acceptance.
Again, it's not your job to do it and I think it is a shame that anyone should even have to do it.
But some of those people staring at you and wondering why you are doing that might be just like me 10 years ago. Ignorant, but able to open their eyes and mind if only they had a teacher.
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Mom to 2 exceptional atypical kids
Long BAP lineage