There are 1000's of them so I wouldn't consider them a monolithic bunch. I will also say it could depend on how long they have been a billionaire and how they obtained it could play a role. The longer they have been a billionaire the longer they have had people either kissing up to them or trying to sabotage/use them. So they can be expectant that things will go their way, I have seen this happen with Hollywood stars who have been famous for a long time. It is almost like they forget that people don't exist for their benefit.
Also could you provide us some insight into the nature of the interaction? Was it just social, where you pitching something to them, or you kicked their butt at pickle-ball and they were poor losers?
We are all able to be jerks on any given day so maybe you just caught them before their lunch and nap lol!