'You surely don't expect me to be arsed to check exactly who played what in a crappy d'Oyly Carte production that tried to satirise English politics by setting it in Japan, do you?'

Not a matter of what I expect, Diane; but what you should: accuracy will enhance your point; inaccuracy undermine it. You thought you could rejoin by showing your knowledge of the work in question (never mind how 'crappy' you might consider it) was equal to mine; you demonstrated the opposite - and then tried to make a virtue of getting it wrong by turning defensively aggressive when this was pointed out. Bound to convince everyone of the rightness of your position — not.