Another critically considered logical reason why an individual might not waive in a Corvette that does not require snobbish behavior on their part. Visibility. The windows are usually tinted dark. The roof line on a Corvette is about even with the bottom of my ribs. When I sit in a Corvette, my head is jammed up in the roof. I wouldn't see anyone waiving unless they ducked real low in front of the hood while I was ducking to see them below the top of the windshield.

In a truck, I'd be sitting nice and high with good visibility. I'd likely catch a person waiving out of the corner of my eye and have no problem waiving back.

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Spock Jenkins of the Vulcan Jenkins'.