even so , the first reaction that comes to you is to stomp the guy. he obliviously has grave mental problems. you feel the need to add to his torment. the guy didn't hit you with any of his body parts and this elicits violence from you. if he steps to you, have at it but other wise what's the point. 

Is there an epidemic of homeless people being beaten that the news isnt reporting on?
Read the story, Pellius was being harassed and stood his ground. Maybe it didn't happen like that but according to his account he was threatened, maybe when someone takes an aggressive stance towards you and flashes his genitals you respond differently, that doesn't make you right.
Plus this is getbig, everyone is a tough guy who doesn't take kindly to disrespect.....