Is it socially unacceptable for a working class person to drive a super nice car?

Is it socially unacceptable for a working class person to drive something like a used Mercedes Benz S550 or BMW M6? Or pretty much a car that's theoretically "better" than their bosses or supervisor?

I mean cars that were once $100,000, now $25,000. They still look super nice, but aren't worth it's original value. Technically it's depreciated so much that it's something a "working class" person can afford, but then again its still a $100k car.

If you were a boss and one of your employees showed up say in a 2008 BMW M6(and you had something newer and more expensive, but not as "cool"), would it make you seem them differently? Say this was a good employee that does what they're told and they never slack off.
Added (1). Reason I ask is because a relative told me that if you ever work for some one and you want to buy a car, stick with the normal stuff like Chevy, Toyota, Honda etc. And if you want a little luxury get at most a premium brand like Buick, Acura, Volvo. No BMWs, Audis etc.

Is that just BS?
Added (2). Also, assume you work an office job or something that pays decent($40k a year).

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