This sounds like two little children having a silly fight. It certainly doesn’t sound like a PARENT
and a child.
Tit for tat, goading your son, it really sounds like you need some support, as you’re clearly overwhelmed and probably making things worse.
You sound like you’ve dished out so many punishments, and extreme number of chores etc that he doesn’t really have anything to lose by behaving badly, as his life is pretty miserable anyway.
I suspect you don’t have clear boundaries and it’s all a bit chaotic (you’ve already told him the party is cancelled, even though it’s not?!).
I wouldn’t cancel the party. It’s not effective to not have a pretty immediate consequence. Natural consequences are much better than a tit for tat of “you call me a name. I take something from you. You’re upset. I tell you not to cry. You get upset again” etc etc.
The interactions you describe with your son really sound like you’re winding him up. I’m not familiar with how Autism will play into all of this, but for any child, I’ve always lived by the rule that “it takes two to have a tantrum”.