Rare negative customer interaction

So 99.9% of my customers are very polite mostly like older retired people. I go to do a dismount and I'm partially blocking a driveway as I walk past a car I thought was just parked I see there's an older guy in the driver's seat and I give him one of these 😬 and a wave like shoot sorry I didn't think anyone was in there I'll hurry up and I try to like speed walk to the box and back to my vehicle and while I'm doing that he revs the shit out of his car over and over again and I hop in my vehicle and this dude goes into reverse pops backwards like 2 feet like he's gonna hit me with my door open and stops and I honk at him and yell HEY. Like tf is wrong with people. And this guy left and came back maybe 5 min later. I know I shouldn't of been blocking the driveway but also hey can you just act like a normal person who doesn't have mental illness