Hollywood actors being vapid idiots is a trope, or rather reality, as old as Hollywood. Every time they go on Letterman they have to carefully follow the script written for them to avoid embarrassing themselves and the industry. And they often fail at that.

BTW, actors are very often prostitutes. Have been since ancient times and the association has stuck. Mediterranean yachts are packed full of C-lister actresses/hookers. Not to mention most of them get jobs by sleeping with producers, which is just an indirect form of prostitution. I don't know about you, but classy is the last way I'd describe Jennifer Lawrence sucking Weinstein's dick.