Trikes are usually ridden by older people anyways so it's possible this person actually is legally handicapped and didn't want to take up the whole spot since they have a smaller vehicle.
They were probably attempting to be courteous here, not an asshole.
Well then the handicap person can just find another spot that doesn't have a tricycle parked beside it /s. "The handicap person needs to work around this tricycle driver" is totally opposite of accessibility.
So you'd prefer the handicapped individual to have no parking spot because the trike parked dead center in a spot they don't need the space for, rather than them having to reverse to get the ramp on the correct side?