Oh anything really. Ranting on HN. Telling off sales clerks. Pushing to the head of the subway line. Anything you get away with because its anonymous. In the old days, you'd know every clerk, everybody in a line, and get harassed if you were antisocial.
That's very much a modern view. And not shared around the world at all. Racism is of course wrong. But social norms are the glue that holds us all together, to a degree. Its not black-and-white.
