They have

It was a typical autumn day. You were strolling quietly through the city, sipping your caramel cappuccino. As you crossed the street, you heard someone singing and playing a guitar. A cute boy was singing on the street, stuffing coins into his guitar case. You stopped to listen. The boy's voice was very pleasant, and he sang with a smile on his face, despite the cold. Everything would have been fine, but suddenly some alcoholics approached the boy and started shouting:

—When I was your age, I was studying and working in a factory, and you sing songs!

The boy started to panic a little and say that it was "none of your business", to which the drunken men started beating the innocent guy. What will you do?