Not shy to be unshy

I have seen a lot of people labeled as shy. Some of these people who had just had a unpositive encounter will be protected later by friends or aquaintences by simply stating that "that person is shy" as an excuse for there ungracious or even somewhat rude behavior. While I believe many people are shy, I also believe that people often mislabel people as shy who simply don't like talking to people in general or more specifically don't like or want to converse with or associate with certain people. Maybe even this consistent behavior has led to people to lose social prowess they may have otherwise had, had they been interested in meeting people.