I was coming back to work from lunch today when I saw another bike in the bike lane ahead. He was on an old mountain bike, wearing a safety vest and BMX helmet. He kept singling for a right turn, but never turned. He was going pretty slow, so I quickly caught up to him, then waited until there were no cars passing by an swung out into the middle of the right car lane and passed.

As I passed him, he started yelling. I wasn't sure exactly what he was saying, but there were some expletives. I didn't think he was shouting at me, so I ignored him and kept going. At the next intersection, the light turned yellow just as I was going through.

About 100 yards later, the same guy buzzed by just barely to my left. He turned around a glared at me as he passed. He must've had to run a red light (at a very busy intersection!) and go way faster than he was going before, just so he could catch up and glare at me. Luckily, my turn-off was just after that, so I could get away from this guy whose day I had apparently just ruined.

Is there some rule or code or custom I violated? He was very angry, and I have no idea why.