I will say, I give extra leeway to motorcyclists. I respect their choice to get out of the cage. And yes, some people think motorcyclists are asshats with how they ride (and some are!), but quite often they ride like they do for their own protection. I.e. lane splitting in Cali, faster accel off lights when they're in front, etc. Too many idiot car drivers out there. I'd rather not be one of them, and I give motorcycles plenty of space and courtesy. It's somewhat empathetic, as I'd appreciate the same being given to me when I ride.
Pedestrians and bicyclists I also don't mess with.
For the latter two, I don't want to make a mistake or mistake in judgement or even give the chance of a vehicular manslaughter/assault being slapped on my record. As the driver of the larger, more dangerous vehicle, I do have extra responsibility to not wield it as a weapon, either as a feigned or actual threat. If pedestrians or bicyclists are doing something bad, I'll honk at them, maybe yell out my window what the problem is, and move on.
Lord knows, bicyclists are at least more active and healthier than I. Who am I to criticize?
Oh, and I flash and allow 18-wheelers into lanes on the freeway when they want to, because, well, they're friggin' bigger than me and can kill me if they make a mistake. And it's satisfying to get a thank you flash of the running lights.