When I am upset about being humiliated, the first thing I think to do is post publicly about my humiliating experience.
Seriously though, there will be no public backlash from this. Like MIR said, people understand that there are students working the gates who just want to collect a paycheck and not get fired. You’re there and you’ve got time to spare, just ask to speak to someone who understands the actual rules instead of someone who probably stares at a big poster as they’re clocking in that says “clear plastic bags ONLY.”