When you have that kind of political power, and ask for the name of someone you are obviously threatening physically, it is in and of itself a threat. He was asking for his name in a way that to me seemed to threaten ‘I will make you wish you hadn't messed with me’. When elected officials have the power and connections to have you audited, or keep you from getting specific jobs, grants, scholarships, etc., etc. you are smart to worry about giving them your name.
The Congressman could have said, ‘no comment’ and left it at that.
If the kid doesn’t want his name known to the congressman, then he has no business stopping him on the street with a gotcha camera running. Sorry, but stopping someone with a camera running is not the same as asking someone for directions to the nearest McDonalds.
The camera running is not neutral.