If I were to associate asking for the $6 back with level of wealth, I'd associate it with someone who grew up poor, not rich. To people born middle class and up

If I were to associate asking for the $6 back with level of wealth, I'd associate it with someone who grew up poor, not rich. To people born middle class and up this is not a notable expense. If anything, the number which isn't worth thinking about should go up with the level of wealth. However, that's a big if. I really wouldn't ascribe it to level of wealth. If they wanted to split the bill, they should have made it clear earlier, certainly not after paying the bill. It's not class, it's just being a dick. Which is to say I agree with you. :)