I don't know about the guy in the video and the rules in the states concerning check points but it seemed to me a petty attitude not to answer a simple question like "are you an american citizen?"
We have these check points all the time in ontario...
About a month ago coming back home from a funeral in Timmins...They had a combination OPP MNR and DOT check point.
The OPP ask me the usual questions very politely, then noticed I was driving a diesel, and asked me to pull over for the department of transport to check my vehicle for coloured fuel.
I've had this truck since '97 and have never been checked and wanted to see how they checked that, plus I was was hoping the the DOT Officer would be as pretty as the lady OPP that had stopped me and I could imagine her with a syphoning hose;-)
But I was out of luck....she came over a minute later to tell me to go because the dot was busy with a logging truck.....