I loathe the autistic kid in my class
What is the reason why you feel that you loathe them?
He's a stupid Brat who attracts too much attention from other people.
It's understandable that you wont like everyone that you interact with. As long as you aren't being actively rude to them then it's fine to dislike people.
I want to humiliate him in front of everyone and his father
Well it is not right to go out of your way and try to humiliate him. It is fine to not like him but there is no reason to act on it. Make sure you understand how the autism effects the individual though, and try not to judge them on the things that they do not have control over.