Hollywood creates such monsters, many of whom are crazy, then foists them on the unsuspecting public
Stars who believe their own hype are quite foolish, as it is something manufactured by record labels and studios to increase sales. Some artists who are called "queen of pop" "pop princess" "prince of pop" "R&B princess" or "prince of R&B" do actually believe they are princes and princesses.
As a result they behave in an outrageous, terrible manner, trampling others. Contrary to what some stars think, scientifically I can assure them, their doodoo does stink, the world does not revolve around them and the sun does not shine out of their backsides.