Being in Amsterdam, I have the "right" to be rude to everyone who's not on two wheels (not many people), but yesterday, some jerk pretended that I should cross on red light and when I positioned myself in the pavement, he yelled at me in some language I didn't understand (judging for his looks he was of indian descent), so I cursed him in catalan in return. The main problem here are moped drivers (allowed to use the bike lanes) who pass you by the right. Rude, clueless and profanity-motivator but not really hostile.

In Barcelona I've found some idiots who will get too close to you, but the main problem are hostile peds. Basically, people who hate cyclers and thus walk into the bike lane and get surprised at bells being rung at them shouting "you've got no right to do that" accompained by several mentions at your lack of education and your mother's profession. Usually the universal "bugger off sign" helps.