The other day at CLT I was instructed on downwind at 7000 in the CRJ-200 to slow to 150 knots. I said, "Unable". She repeated the instruction and I told her I was not flying a helicopter and can't slow to that speed on this part of the approach. No final flaps and gear down at 7000 feet on downwind.
When I landed I was told the call the dreaded number. I did and talked to the supervisor in a very calm and apologetic voice. I think he understood exactly why I couldn't slow the CRJ-200 to that speed.
I apologised and said that I was out of line to say in a snotty way that I couldn't fly that slow because I wasn't a helicopter and he thought the whole thing was funny.