While you could have handled this situation in a much better manner, which you didn't, a red tag wasn't initially really required,for your case. The person who controls Avirunes account had bought it and made his name, point being not all account buyers are trying to game the system or whatever, but since you tried to sell an account to a random person, its hard to conclude if you really wanted to sell it to a non "red-tagged member". Bitcointalk community works in a odd manner, just like everything else. While the tag doesn't make you a scammer, it doesn't make you look like a trust worthy person either. A new person would obviously judge you for the red tags you received, and not for the green tags.

All I can suggest you to do is, instead of being an utter asshole, try sorting it out with Lauda and The Pharmacist privately.