I'm going to laugh when my coworker mispronounces things
Why would you laugh at your coworker for that?
I just love to see them make a fool out of themselves
You are really rude, it is not necessary to make fun of people's way of speech. You don't know if they're foreign, they don't need their efforts trampled on. Rather help them say things correctly.
I'll do what I want since I have no reason to have respect for a coworker.
Well if you laugh at them they may get mad at you. Why not just let it go and avoid bad feelings at work?