The security guard was probably just doing his job the best way he knew how. He's likely a low-paid employee of a private contractor that has a blanket how-to manual for all of their clients. He saw a bike and figured he'd get to show off his skills to his employer, perhaps for a raise...

Hopefully this will spark some much-needed education of the security contractor and the employees. I'd hate to see the guy lose his job. Next time, perhaps he'll give you a nice wave.