Indeed, a man by himself insulting another on the basis of race, may get a knuckle sandwich. That's why 500 mostly males marching to deny human rights to people of color may be doing it for safety, because they know that individually they would face physical response for expressing their bigotry. It's strength in numbers. What one can't say, five hundred can bravely say. That is, if you can call such sissiness "bravery".