>While this 'say what you see' served as a functional ice-breaker, as an introvert I found it strangely confrontational, almost like an interrogation

On the other hand, why see "introvert" or "extrovert" as something that you essentially are, and not an accidental attribute, one can, and perhaps should, work on?

In that case, his 'say what you see' routine would be a good testing ground to stop caring as much for the supposed "confrontation"...