 They don't know about the association between autism and it. Some people also believe that only ASD 2 or ASD 3 individuals experience this, or that it's something that you only experience in childhood or early adolescence. This is not the case, of course. So due to this, people can't really comprehend or accept that we can't speak sometimes. Only if you're someone like me who presents, I guess, a little bit more neurotypical than most autistic people, who perhaps has a lot of social, worked on their social skills for quite a long period of time, communication skills, and then perhaps you go and meet somebody as a friend, or as a relationship, or some extended member of the family, and they don't really understand why you stop speaking.