It sounds as though the OP was holding the "timing slip" where any/everyone could see it. How about trying this. If selected again for "timing", follow your normal path. But, keep the slip concealed until you clear the security CP. Then offer the slip to the last person at the CP. @:-)

I agree with the other posts regarding the complaints. Take that info to anyone and everyone at the airport and TSA. Be sure to copy the airline(s) as well.

You are a customer, not a criminal. You were making fair observations about a process for which you paid (say Security Fee). The LEO and TSA supervisor were way out of line.