I've been cycling to work now for the last 13 years, and in that time must have racked up over a thousand incidents, mostly minor, on the roads.
The majority is groups of kids hanging about and making comments as you go by, ranging from swearing, general insults, to things like "oi mate! That's my brother's bike, he had it nicked last week, give it back!"...while I was waiting at some Red lights. Needless to say my response isn't worth printing, but as more of his group of friends rushed up to "back him up", I got the feeling that the cars next to me waiting at the lights were not going to help. So I reached for my chunky D-Lock and I was prepared to use deadly force to defend myself.
At this point the kid who made the original claim backed off and walked down the road, soon followed by his moon-faced followers, boys and girls aged between 10 and 16.
This is probably the extreme end of my experiences out on the road, but generally I've had more bad luck with pedestrians who just can't seem to ignore the fact I'm cycling on the road without commenting, than with other road users.