Shortly before Christmas I inadvertently stumbled into the mother and father of a spat about gender and fair play in sport. It began with an instinctive reaction and a tweet that I wrote on a serious forum dealing with the subject. “You can’t just proclaim yourself a female and be able to compete against women,” I tweeted. “There must be some standards, and having a penis and competing as a woman would not fit that standard.”

Perhaps I could have phrased it more delicately and less dogmatically, but I was not prepared for the onslaught that followed, chiefly from a Canadian academic and transgender cyclist named Rachel McKinnon.

McKinnon won the Masters Track cycling world championship in Los Angeles last October in the 35-44 age