There are a number of considerations with your criteria. First, I know Phil Barnhart, and unless he bought the most expensive Tesla sedan recently, his outlay was about $65,000 5 or more years ago. So I think you misrepresented the facts and thus accused him of something he did not do.
Second, your principle is that if one purchases an expensive car, then no matter their votes, their humble origins (if they have them), or their morals, the act of owning a $100,000 discredits all of that. 
Third: Our system is based on voting in the rich. The median income for Congress is over a million while the average for Americans is about $53,000.  Does your criteria work in reverse? DeFazio drove a Dodge Dart (I think) for some time. Is he thus "in touch"? 
I can see if one believes in such simplistic generalizations one would walk around making superficial judgements about the good or bad in people. Is this the way you normally think and, what is it like to judge people like that? R U ever wrong?