I don't think this has anything to do with someone's right to do anything.
It has to do if someone should do something.
It's about having consideration of the total social environment surrounding them, and what is generally expected in that particular setting.
How much was paid, IMHO, has absoulutly no bearing on if that gives someone additional rights to break the expectation of what is generally exceptable in that setting.
The attitude that "I can do whatever I want just because I paid lots of money" (or used an upgrade) doesn't sit well with me personally. That's nothing more than saying that you think you are purchasing some sort of special "waiver" of acceptable conduct, IMHO.
It's all about taking into account the considerations of others, and how your actions effect the experience of others. IMHO. If you go to a five-star restaurant where everyone is dressed rather nice, and someone comes in dressed in swimming trunks and flip flops just because there is no rule against it...it can ruin the experience of "elegance" that others have come for.
I suggest, don't be one of those people that "do whatever the hell they want to" in social settings. Have consideration of how your actions will effect others experience. Be nice. Fly right. And use your own good judgment as to what is "right" to wear.
There's a reason the airline's have a strict dress code for their employees flying in First Class.
IMHO.
[This message has been edited by PremEx (edited 08-17-2000).]