Why didn't you call the cops on the guy with the booze on his breath?
He's possibly driving drunk, and is aggressive and stupid enough to chase down somebody on a bike, WITH HIS DAUGHTERS IN THE CAR, and confront them. Eventually, he could hurt somebody, probably somebody who doesn't deserve it.
Strangely enough, you may have done something that was illegal, or 'stupid', if you went around the van waiting for the light to change on shoulder, or in a turning lane.
If I'm picturing what you did correctly, it's pretty risky, also.
Most people don't use turn signals, and it's real probable they'll turn in front of you, or even intentionally try to block you.
My motto is..."let the dumbarses kill themselves or each other, and I'll be glad to give them the space to do it!"