As you said in your article, sex is fact, gender is fluid. Those opposed to transgenderism could be opposed for a whole host of reasons including social, political or religious. Dismissing anything that disagrees with the default liberal position (you can do what you like as long as you don’t hurt anyone) as bigotry doesn’t help forward the discussion. I would argue that it’s counter intuitive to the aim — it puts Conservatives and the religious off from engaging in a much needed discussion. These throwaway phrases matter to those who are easily offended in the world of weaponised offence.