Oh, you're definitely wrong. Cyclists ride two abreast, deliberately, to minimise the possibility that potentially dangerous drivers affect them.
Just for the sake of balance - the last time I was tooted at by a driver was on the road south out of Aylesbury. I was close to a pinch point before a roundabout, so I positioned myself well out into the road, looked behind me and saw a yellow van. I shrugged at it, as if to say "what am I supposed to do about your impatience?"
When I got to the roundabout I decided to be generous - it's a decent two-laner with no right turn. So I went well over to the left to allow the van past. The "van" turned out to be an ambulance with its blue lights flashing. It proceeded up the road at a very stately 40mph.
I still haven't worked out why, if it was on an an emergency call, it didn't go just a little faster, or add its sirens to its lights. I know that ambulances carrying some patients to hospital won't use their sirens, but since we were going away from the only hospital in the area I'm completely at a loss.