usually ignore them.
Though the thread does remind me of a semi-funny a couple years ago. Wife's brother and dad were in town, and we were all in the car driving to a restaurant. On the street corner is a guy with his sign looking for money. My wife, friend of humanity, wants to give him a $1. Both her brother and dad erupt in the backseat with "he's just going to use it to buy beer" and other shouts. We drive past, go to the restaurant, which sits adjacent to a 7-11. Halfway through our meal, same bum walks by the front window carrying a case of beer in a 7-11 bag. Laughs had by all.