Originally Posted by
redtailshark
Buy a newspaper from the stand nearest the counter where they deny you boarding. Ensure the receipt is time stamped. Take a photo of the agent who perpetrates the offense. Inform them politely you will be taking the matter up with legal authorities.
This is what smartphones and Youtube are for. Document it all with a nice on the spot video. In many cases just the threat of a Youtube video will assure compliance with your wishes. But be careful as it can also lead to violence when you shame someone!