I was able to understand this phenomenon a bit when I realized that a number of Tesla supporters are simply pro car. Thus pedestrians, cyclists etc are considered interlopers to the roads, and if the supporters weren't Tesla enthusiasts they'd be making similar comments when driving their dinosaur burner.

It doesn't justify their comments, but at least made me understand a bit.

(I'm the opposite and believe all roads except controlled-access freeways and rail roads are for humans first, and then cyclists -- cars are there on sufferance)