Homeless people

So today i was waiting with a friend for the bus. We were just standing there talking doing nothing extraordinary, when suddenly some dude came up to us like out of nowhere. He was kind of fat, carried a big bag with him and he looked like a bum. He looked in my face and said "Is there a problem?" and i was like "no not really". He then totally agressive "Well why are you looking in my direction all the time?!". I honestly didnt notice it and im not sure if i even did it. So i responded "yeah sorry dude didnt mean to anger you or some sort" and he told me "yeah ?! I will show you MY anger if you continue". My buddy and me totally confused didnt look after him after he left. I think he wanted some respect, because hes a bum (if that makes any sense), but he surely lost all of mine!