I didn't find that the actual celebrities were any more demanding or rude than normal non-famous rich people. If anything, they tended to be unassuming - perhaps because they were concerned about their public image. More than a few times, I was unaware that they were famous until one of my employees said, "do you realize you just helped <so and so>." Some were very down to earth and pleasant to talk to.
Heh, you obviously never dealt with Patti LaBelle. I was a concierge at the Lowell Hotel, on E.63rd St. in Manhattan; and, she was staying there with her entire entourage of miserable syncophants during July/August 1987. It was a toss up as to who was worse, LaBelle or her personal assistant. The PA handed over a 40 page rule book on how we were to conduct ourselves in LaBelle's presence. The funniest was that we were not to make eye contact with this bloated diva. Everyone on the staff (management included) ignored most of the provisos, especially this. It drove her crazy. Tom Hanks and Shelly Long were also guests during that same period. They were filming "The Money Pit" out on Long Island. Tom Hanks is truly an unpretentious, down-to-earth guy. He was always talkative, friendly and even took the guys to Tommy Makem's Irish Pavillion, among other places, for drinks. Shelly Long, on the other hand,
was Diane Chambers. She pretty much tied Patti LaBelle as most annoying yenta.