I think how cyclists behaves depends on where you live. The nearby town nearby where I used to live, had a pedestrian thoroughfare running through it with clear no cycle signs, there are some cyclist who just ignore all that, not kids either. I actually said to one woman who came up behind me, not riding fast, although some cyclists do, "you aren't supposed to be riding your bike here" I said "I know what I'm doing" she replied and then rode right into us we weren't hurt, because she was slow, it was unintentional the bike was unwieldy and she was incompetent on it, she shouldn't have been riding it in a pedestrian only area, I did say "maybe you'd be better off riding that in the park" she went off muttering. I know most bike riders are considerate and those who are arguing the case for cyclists on this forum will be, but there is a divide.
Some behave like pigs though, think nothing of banging on the bonnet of cars when they catch up with them, covering people with spit. In London they can be unbelievably aggressive, if the pedestrian doesn't get out of their way quickly enough they go ape shout and swear, the people I know who work up in town often moan about them. Pedestrians have been killed by cyclists.
Lycra cyclists hog the roads that run through Richmond Park, 20 mile hour speed limit except for them they do what they like they're extremely intimidating. A friend told me about a woman she knows who made the mistake of overtaking one, he caught up with her when she had stopped in a car park, swore at her then chucked his bike at her windscreen, with her child cowering in the back. Fortunately, a horse rider saw the incident, it was reported, don't know what the outcome was.