Yup. It was a little more than him being impressed with Michael's heart. A kid refusing to take his money is a challenge to his status just like the security guard who challenged himHis rise shows him being super serious of how he's perceived on the streets. When he went on his campaign to announce himself as that guy, last thing he thought was that some little kid would publicly turn down his money. (In front of other people).
Took it personal, stepped to him in front of the people who saw it.