He is a narcissistic pathological liar and he hates to be made fun of. He is famous for being sensitive about his ears, and he thinks his Mussolini heat tilt is flattering.
The best way to drive this a$$hole to the edge is to belittle him every chance you get. Encourage others to do the same. Laughing at everything he says would do much more than responding with logic and reason.
My first line of attack against leftism is to propose even more ridiculous assertions than what they propose. It sometimes takes them a while (subtlety is not their strong point) but eventually they figure out I'm mocking them. And then they go ballistic.
It's fun to watch.