I treat trans activism the way I treat religion, too, Matilda.
I'm an atheist. When I'm discussing religious matters, I do my religious friends the courtesy of referring to God, and not "your invisible sky friend". I respect their right to hold their beliefs as they see fit, but I need not in any way respect the content of those beliefs.
Same with trans. You may believe in the existence of a female brain in a man's body. I can't gainsay your belief, it's your to hold. But I don't have to share it, because it flies in the face of what I believe about the world, and the science, as with God, tends to back up my version. If all you're fighting for is the right to hold your belief and suffer no oppression because of the fact that you hold it, I'm cool with that. Have at it. No objections from here.
But, to stretch the religious analogy to breaking point, the second that you start to try to impose your beliefs on me, by inserting religion into my life, by insisting that I live by its rules, then frankly, all bets are off. As with transactivism - I will resist any attempts made by AFTAs to reshape the world into a one that suppresses my ability to live my life freely and express my thoughts, or that tries to roll back hard won freedoms for women. I will vigorously defend my rights as a woman, because goodness only knows the world isn’t short of people trying to shit all over them.