I don't know that a front desk clerk could actually revoke your diamond status. But I'm sure there will be something on your "permanent record".
I think the Patriot Act and all of the hype about "for our security" and "to save the children" has given all travel related employees the powers to search and arrest. If you even question one of them you are no longer allowed to travel that day - or if you get them mad forever.
The "soup nazi" now is considered to be a nice guy.