I'm going to make fun of a kids disability
Why would you make fun of them for that?
It's funny.
I think it's terrible to make fun of someone's disability, especially a child. They can't help that they have a disability.
I should make fun of them more.
That sounds really hurtful, you should be more empathetic toward people. You could become disabled at any time and you wouldn't want someone to make fun of you for it.