'some of this “kindness” is just about status, fashionable causes and power over others who don’t know or who object to the new ways of speaking'
This.
When you find yourself able to say in a comment 'I was surprised when Sir Robert (Winston) said that (you can't change sex), it's intended I think as a display of cultural power, that she is so much more up to date and modern.
Without wanting to present Sir R as some kind of icon - nobody is perfect, everyone makes mistakes - to find yourself contradicting someone so eminent in exactly this subject on something so fundamental, and not consider whether the ideas causing you to do so could be flawed, shows both a naked cultural power grab and an intense kind of stupidity.