"You people, you're normal. Me? I'm not just normal, I'm extremely normal!"
That's definitely not something only someone very weird would say or anything. It sounds like the sort of thing any extremely normal flesh-covered hairless hominid like myself would say.
It seems like he doesn't know the meaning of "extremely" or "normal" here. Or maybe both? "Extremely normal" is an oxymoron, and he's just a regular moron.