I saw an autistic kid in a camo jacket today. I said to my friend, "Hey! Look! It's the special forces!"
Do you have a problem with people with autism?
Nothing malicious, just a joke that doesn't need to be taken seriously
Autism can affect many people differently and some more seriously than others. Some are  highly functioning and of high intelligence, not dumb at all. You should learn more about autism from some scholarly articles to gain more understanding of autism.