The Ben Affleck character is at the high-functioning end of the autism spectrum, which means, among other things, that he has no social skills.
I also have no social skills. It’s exhausting just to be polite to people most of the time, let alone trying to be fun and interesting.
I’d like to be diagnosed with something that gives me a medical excuse for not having to do that.
The Ben Affleck character also has some cool and useful skills that he learned from his dad, whereas my dad never taught me anything except how to hold a grudge (not always useful).