I was going to write a comment but you pretty much said what I would have.
I think it's also worth drawing a distinction between the terms "Working Class" and "Proletarian".
The Proletariat - the Revolutionary Class - in its purest form means to "own nothing" - a renter who walks to work or takes public transportation, doesn't have a college degree, doesn't manage others at work but is himself managed.
In modern America few people fit this platonic ideal of proletarianism, but artists - including actors - are generally not considered to be proletarian, nor would other celebrities or athletes.
This isn't to denigrate artists or actors or anyone else, just to get language straight in order to reconcile the cognitive dissonance of these sometimes very-wealthy people being "lumped in" with those that we more traditionally think of as "working class".