I'm going to yell at my autistic friend
Why would you yell at someone that is autistic?
He just can't understand how I feel
You have an anger issue with someone who doesn't understand you better, but autistic people have a mental issue they can't control. You have to be more lenient with them, they can't help it if they can't grasp onto some facts. If you yell you will be abusive and nasty.
I don't care, I'm going to do it anyways.
Well I think that's awful and you should never be mean to an autistic person in any situation.