It's difficult to give cyclists plenty of room even on the bike when they ride 3 and 4 abreast down country lanes where I live, idiot lycra louts even the horse riders are p****d off with them. Sorry no time for them think they are above the law and common courtesy on the roads.
^ This. Cyclists that ride side by side, effectively blocking the lane for vehicles coming up behind - yet they are quick to hold the car driver accountable, for overtaking too closely. Cyclists are most likely car drivers too, so you'd imagine they'd have more understanding and maintain a single line, behind the wheel infront.
Plus I don't want to be forced to stare at their rear ends in lycra for a prolonged period of time, while waiting for a suitable opportunity to overtake, as they are also forcing the car/van/truck to overtake completely into oncoming traffic, to get past (due to taking up the whole width of the lane).