My main problem with cyclists as both a pedestrian and in a vehicle comes from them seemingly arbitrarily deciding when they're a vehicle and when they're a pedestrian.

They'll blow through stop signs and red lights, then yell at you for being in their way, they'll illegally turn in front of your vehicle, then yell at you for not giving them the right of way, they swerve through traffic changing lanes without signaling then again, will get angry with you when you have to slam on your brakes to avoid killing them, they'll go back and forth between the sidewalk and street without paying attention to pedestrians or cars and yelling at anyone that gets in their way.

My experience has been, they wish to be treated like pedestrians, as in, have the right of way whenever they want, whether it's with a vehicle or an actual pedestrian, until they decide they're actually a vehicle.

For me, when i'm on a bike, i'm a vehicle. I obey traffic laws, yield to cars much of the time, because they will crush me and give pedestrians the right of way at intersections. Cyclists that don't do these things piss me off.

ETA: This may have come across like I was targetting all cyclists. I meant, the ones that do things like this are the ones I have a problem with. There's plenty of cyclists I see more often that don't do things like this. I have no problem with them I don't judge them as a group. I dislike in general when people do dangerous things on the road. Whatever vehicles they're in or not in. These just so happen to be the shitty things i've experienced cyclists doing that bug me.