I don't mind being called "Blue" at all. He told me his name too, but I call him "Coach." If we were like for like he'd call me "Umpire." I think that's worse!
Pretty close - the travel teams from Ontario and Quebec call us "Umpy" during summer tournament season. Always an interesting one to hear.
Anyone who calls me "Umpy" other than my 4 year old cousin gets immediately ejected