I live near some canals, and use them regularly to get about. Very convenient. Problem is, loads of other people have the same idea, so it can get a bit congested. There's a section of the Regent's Canal that comes up from near Canary Wharf, and during 'rush hour', there's invariable loads of cyclists along there. Sadly, some of them are total knobs, and tear along with little consideration for others. I've seen a fair bit of 'towpath rage' along there, and have had do's with picks who go too fast past people, don't give people room, don't use bells and are generally arseholes. I then get flak off people who see all cyclists as the Antichrist.
Thing is, if these people were in cars, they'd be knobs in cars. They just happen to be on bikes. Sadly, there seems to be a growing number of selfish **** who think everyone should get out of their way, and that their journey is more important than others.
And as this woman points out; it's very often not the 'Chavs' who are the worst offenders, but smart, 'respectable' Middle Class types on nice bikes. Selfishness has no class boundaries, it seems.