you're probably never going to understand the humor behind the word so i will just stop trying.
Here's the deal - you saying the insult so much has effectively devalued the shock factor of it so much that it means absolutely nothing when you call people autistic. You've called practically everyone autistic at this point. Your frame of reference of what is considered "Autistic" is so broad at this point that it's hard to be insulted by your posts.
I don't know what you're not getting about this, it might be because you're actually autistic.