He's possibly the most arrogant person I've ever encountered in real life.

He thinks he's the foremost expert on basically any topic, from literature to politics, to science, to videogames etc.

Elaborate on this real life encounter! I am curious.

Way too many techies believe they're secretly Renaissance polymaths.

Domain expertise rarely transfers to other domains. You, the random developer, are not going to have brilliant insights on the law, environment, consciousness, politics, or even another area of tech you don't use, by thinking about it for 5 minutes from "first principles" before commenting.