I had the same problem when purchasing my M3 from a dealer in CT until I showed the salesman a bank receipt, then his attitude changed quickly.
I was 25 at the time and had just come back from playing basketball with some friends and was wearing some gym shorts and a t-shirt. I guess the salesman didn't think a young guy wearing some gym clothes was serious about purchasing a 80k car.
Unfortunately, most dealerships will act this way towards younger guys.
Pull up in a nice car, wearing something decent and most salesmen will allow test drives.
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