That's why I advocate making fun of him instead of having an angry confrontation. Let everyone around him know what a contemptible, pathetic little worm he is. If you shout and scream, you get arrested yourself, but if you are choking with laughter and trying to drag other people into the contemptuous, derisive laughter, there are no grounds for arrest. Being laughed at is far harder on someone's ego and far more likely to make them go hide.
Both anger or laughter are reactions. It is the one who is knowingly pretending to be something he is not who is the provocateur.
Try laughing & pointing publically at a prancing Gay Pride faggie and see what happens. HATE CRIME!!!!
As for post Vietnam discharge, I was told you could wear your uniform until you arrived at your home of record. BTW we didn’t have the `Ruptured Duck’ emblem of the returning WWII vets.