Trigger words: introvert
Indicator sentences: That's the definition of *introversion*. The same source, Merriam Webster, defines an *introvert* as "a shy person : a quiet person who does not find it easy to talk to other people."
Negotiation parts: That's obviously not the context that OP is talking about since he brought up Quiet. In the context of the discussion, it is imperative to differentiate between shyness/social anxiety and introversion It's okay to be wrong sometimes.
Trigger words: introverts (4) Introvert introvert (3)
Indicator sentences: No, again it's just different preferences.
Negotiation parts: People who are more introverted will prefer less frequent social interaction, or smaller social settings. It's definitely not that they don't like social interaction. For most people, it's incredibly lonely and depressing having no social interaction at all. It's hard to pin down an exact definition because people are complex, and some people will probably have differing opinions on what exactly the introversion/extroversion scale should measure. I should mention that some people might be introverted *and* shy or have social anxiety as well, but that's not part of the definition. The different between introverted and extroverted people is simply just a preference, whereas people with social anxiety experience fear (or even a fight or flight response) in certain social situations. Social anxiety can be debilitating and is a serious problem. Introversion on the other hand is not a problem.
Trigger words: introversion (2) introvert introverts
Indicator sentences: Even if your statement in the title is true, those people would still be introverts. Being an introvert doesn't mean that one can't also be socially awkward or a raging asshole, so maybe it's just that. You don't have to adjust to anyone apart from adhering to general politeness, but you may choose to do so anyway to be a better friend to people you know. What would be the point of extroverts claiming to be introverts? Being alone would cause the first group anxiety to be alone for long periods of time. If one prefers to be alone, isn't that the definition of introversion?