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Springboarding off this post by AE, I remembered a funny little thing I saw recently at a traffic light. Two pickups were idling in adjacent lanes. The drivers were White men. The driver on the right had his arm dangling out of the window, lightly slapping against the door. He looked over at the other driver and made a very unmistakeable OK sign and smiled. The other guy laughed and nodded, which I was able to see through the windshield glare.
It may have been nothing. Just two dudes who may or may not know each other passing an innocent greeting between them.