That's funny.
A GM can't wait 30 minutes to let you finish a raid, but they'll spend hours talking to you while you are going through names for them to free up.
It was a name. We've all seen much worse and 30 minutes is nothing.
Am I saying that you didn't deserve to be banned? No. You violated the rules and you must be held accountable.
However, I do think it's rude what he did, but then again, it was rude of you to ask for 30 minutes.
My view: GM was being a jerk, but was still doing the right thing.