Hey. You are the one reducing what I'm saying as a sweeping all encompassing statement about someone's humanity.

I'm saying that not being bothered to say hi and bye doesn't make you an introvert. An introvert is someone being comfortable with his inner self and preferring deeper contact with few than being a beacon of energy in a crowd.

If you can't be bothered saying hi to a stranger, of course you are still human. It's just not necessarily a trait of an introvert. Its Part of another character trait or the state of mind you're in.