One time I was driving around the Mall waiting to turn right and a group of pedestrians was in the middle of the crosswalk as the hand started to flash. The guy behind me lays on his horn. He caught up next to me at the next light and told me I should have gone. This was an older man with DC plates, he should have known. He said the flashing hand means no one in the crosswalk, and I told him A. That's incorrect, it means don't enter the crosswalk if you haven't already started to cross. And B. That regardless, pedestrians always have the right of way.

He said I was wrong and tried to keep arguing but I just had to ignore him at that point.