There is a practical point which many above do not seem to have considered. When RHO bids what you expect to be the final contract and the tray comes under the screen, if you and screenmate pass, the tray goes back and the other two, INCLUDING RHO, will pick up ...
Actually, it looks like my -380 for 2Dx+1 could be worth quite a few matchpoints. RHO expects to be doubled in 3♦ yet bid it anyway. I am surprised so many people double - whom are you playing against? I think 2♦ was more likely to go down ...
I suppose it comes down to whether exasperation that oppo have been lucky again counts as "a demonstrable bridge reason."
Do you believe declarer should always be allowed to make the contract after this silly remark by South, however he plays and however the cards lie?
Obviously S should have kept his mouth shut, whether he held ♣Q or not. But I suspect he was annoyed by his partner's strange decision to play a 2nd spade, removing a likely losing option.
"You need something else as well!?" would be an appropriate reaction, though one best ...