Living in upstate NY I have crossed the border hundreds of times. I never saw anything like this. They were always polite. The idiot did something that met a profile and then resisted, you’ll see. The only proper response to a government official with a gun is “yes sir”, or “no sir”.
I wouldn't go that far, but in the case of being at a border station and requesting to enter another nation (or even returning from visiting another nation), that is the time to accept that the constitution permits a full inspection of what you're bringing and your person. If this was a traffic stop, my opinion drastically changes. Yes sir and no sir only to constitutionally valid questions and requests, no matter if the officer is armed or not.