This one friend of mine, I really don't like him.
Why don't you like him if he's your friend?
He's ugly, stupid and annoying.
You probably shouldn't still be friends with this person if you don't like them. You should tell him that you no longer want to be friends.
I should cut him off. I don't care if he asks why.
I agree that you should let go of the friendship if you don't like him, but if he asks why, try to be gentle when you tell him you don't want to be friends. He might be annoying to you, but it doesn't sound like he's doing it on purpose, so there's no reason to hurt him.