I think people are sensitive about it because someone likes to post as GUEST and then act like a complete a--hole, then wonder why people get mad at him/her. Some like to hide behind GUEST just so they can behave like an a--hole, without retribution. This has happened here on several occasions.

If someone wants to be part of the conversation without revealing their identity, fine. I don't care. But if someone wants to act like a jerk and they're just hiding behind the GUEST moniker, well, that's just plain cowardly.