Myth #3 – Introverts are rude. Introverts often don’t see a reason for beating around the bush with social pleasantries. They want everyone to just be real and honest. Yes, this is often called being rude. It may be true that by this guys definition introverts don't mean to be rude, but if a person (introvert or otherwise) acts as described above, that is rude.
Being rude is also largely cultural. Sometimes American niceties although superficially are very pleasant can get tiring to people who tend to be more introverted and are from cultures that are more straightforward. Many people I've personally known complain that German flight attendants seem rude which I think is more a cultural difference than anything else. Similarly, however difficult it might be, one must always…
Similarly a consultant friend of mine talks of a US colleague who worked in her office for half a year here in Aus. Just before he went back he lamented that he probably would have had a better time if he'd realised that the people being perfectly polite to him in the office probably didn't like him, and those making friendly fun of him probably liked him a lot.