One out of my three WMs have been very well trained not to accept GCs (bc of me). The last successful transaction I had there, a second cashier slipped a note to the cashier helping me saying "this is the guy we have been talking about." They treat me like a criminal everytime I go in there.
This WM is one with no Money Center, just a customer service desk. The other two have MCs and are much friendlier.