I’ve started to think of intro/xtroversion as a spectrum (because what isn’t) - but if two people who self describe as introverts are locked in a room together

I’ve started to think of intro/xtroversion as a spectrum (because what isn’t) - but if two people who self describe as introverts are locked in a room together the one who is “less” introverted will probably be described as more extroverted by the other person