I think the standard phraseology in that circumstance is: "Forgive me oh fast skygod. I shall continue downwind until thou condescend to my returning to thine vicinity."
I've never encountered a 'fast' aircraft joining and carrying out a 1,500' circuit. If I heard calls from an aircraft doing that at an aerodrome to which I was inbound, I would do what I do everywhere else: have a chat and decide how best to ensure separation on arrival.
Faced with abuse (never happened to me and I don't expect it ever to happen) I would use the standard ICAO phraseology: "Piss off, stupid."