повешу дома, и вытатуирую на ладони)

How can I let the introvert in my life know that I support him and respect his choice?

First, recognize that it's not a choice. It's not a lifestyle. It's an orientation.

Second, when you see an introvert lost in thought, don't say "What's the matter?" or "Are you all right?"

Third, don't say anything else, either.

знаки

ездила к стоматологу - привела в идеальное состояние передний зуб.
на обратном пути заметила заведение с названием 
K R A S A V A

сочла за знак одобрения)