I am sorry to hear that.
I had an uncle who was in charge of maintenance for a large hotel where many celebrities stayed. He had far too many stories like yours of those who were less than approachable and civil.
My uncle had an elevator confrontation with Yul Brynner over his superior attitude that is still the stuff of legend in the local hospitality industry.
His favorite was Anita Bryant. Said she could not have been nicer to the hotel staff.
I always got the impression that at some point, Brynner began to believe he really was King Mongkut.
‘tis true; a few bad apples.....
Another very genuine person is Dan Aykroyd; very approachable and kind.
Charles Kuralt was delightful, as was Max Showalter and Debbie Reynolds.
Morley Safer, not so much...he always seemed to have a stick up his butt.
Got on an elevator [Manhatten] and Mic Jagger was in there. Felt like I was boxed in with a corpse. :)