Cyclists get a lot of bad press... and there is fcuking good reason for it.
A lot will deliberately ride in an inconsiderate manner (from the perspective of both drivers and pedestrians), as cyclists believe it is their right / no law against it.
There is absolutely no law against me not saying please or thank you, or not holding the door open for somebody who is walking behind me, but it's just plain obnoxious.
Tooted somebody the other day for riding on a road that runs in parallel to a mixed pedestrian/cycle way, we then approached a set of temporary lights on red, managing traffic around a 200 meter single lane.
Cyclist comes up behind me.
Cyclist - "Was I getting in your way?"
Me - "There's a cycle lane just there, can you see it?"
Cyclist - "I don't have to use it!"
Me - "Well as long as you're alright Jack"
Cyclist - "You are in a car you tw@t" (not really sure what that was meant to mean.)
Anyway, lights went green, I make progress up the road, and look in my rear view mirror has he forces a line of traffic to follow him up the 200 meter single track at 10mph when he could have just used the fcuking cycle lane.