I think it might depend if the character knows that she is autistic or not. I didn't know I was autistic until last year, and like some other commenters, I had no idea that the world felt different for other people. I thought other people were rude, mean, and uncaring for subjecting me to all these painful things like noises, yucky foods, flashing lights, stinky perfume, and itchy clothes. I would just scream at my Mom and say, "No! I don't want it! It feels (itchy, disgusting, loud, etc.)" I would get angry or cry and go hide in my room or outside in the bushes if it all got to be TOO MUCH, but I didn't know why. My Mom called me Camille (like the opera character) and tell me to stop being so dramatic. Her biggest concern was not looking bad in front of the neighbors or co-workers.
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Diagnosed Bipolar II in 2012, Autism spectrum disorder (moderate) & ADHD in 2015.