Why can't people exit/enter a car properly?

Yeah, not to sound like a dick, but if you get a ride in someones car, esp the ‘higher profile’ cars on here, don’t wipe your greasy hands all over the paint (not telling you this Cossey, I am feeling your pain brah). I know no one would do it on purpose, but think how much work one puts into the car to maintain it’s paint, etc.