My vote goes towards jealousy.

Or dementia, as they surely aren't aware of the @ss-beating they could potentially receive, judging from your avatar. Perhaps the high door sills keep them from scoping that, not sure.

Regardless, ignore them. If you react, they win. Any man that feels the need to yell/curse/talk down to someone, unprovoked, is a weak man and has much bigger issues within. Rearranging his face will only land you and assault charge and make it worth his while. And this is coming from a fellow lifter/fighter

Instead, smile and know that fate will deal with folks like this. Ever read about those freak accidents involving a single car and a chunk of blue ice? Chances are he probably talked **** to a guy in a convertible in earlier days.

Smile, wave, and drive on.