There's no need to attack him because you assume that he's not empathetic to others or is incapable of reading body language.

I really hope this "introvert fad" slows down soon. There's no need to be so radical, there's a spectrum of personality types. It's not black and white. I identify as an introvert. Social situations exhaust me, so I enjoy them sparingly.

If someone makes a funny comment to me in the elevator, I'll laugh and it's okay. I don't rant to him about my being a recluse.