Fun on the Green Line, and Jewel wasn't even involved

The Outraged Liberal gets fed up with the T:

... Attempting to board the B Line outbound at BU Central tonight, I was told I needed to go the front door by a "customer service agent" without any validation equipment while people next to me were allowed to get on the train.

Does my CharlieCard (pre-paid corporate pass account) somehow give off an aura that allowed this person to determine that my hard plastic card was somehow inferior to someone else's card or CharlieTicket (or nothing for all I know). Does my card have cooties? ...