What is "cancel culture?"
It is a passive-aggressive technique used by people who say they believe in the freedom of speech but who don't. It has just been deployed on JK Rowling for saying that transgender women are not women. In the old days that would have been regarded as an opinion which you either agreed with or not. You might even have been stirred to put forward a counter-argument. However, in order to save time and so nobody has to think for themselves anymore, nowadays we just shun people who dare to think contrary to the liberal in-crowd and shut them down so that we don't have to listen to their unsettling ideas. Personally, I think it is the most dangerous cultural trend at this moment in time. What if those we oppose started to use it?