Helen Joyce recently explained her thoughts on this on Twitter
https://threadreaderapp.com/thread/1924037322615456133.html
One of the most irritating thing about transactivists is the way they think everything is all about them. I don't call trans-identifying men men in order to harass them - I do it because THEY ARE men, and I'm not willing to be bullied into pretending they are not. 1/6
As well as doing it because the ordinary way to use words is to describe the facts I see, I do it because these particular facts matter. If I call a trans-identifying man - Robin Moira White, say - a woman, it's harder to say why he should stay the hell out of women's spaces.2/6
Of course this isn't harassment! It's not conduct, or a course of conduct, towards the trans person at all - it's just me speaking standard English & declining to accept the imposition of someone else's quasi-religious observances, thereby indicating a belief I do not share. 3/6
I feel the same about this as I would about a religious colleague insisting I say things like 'I believe in one God, the Father, the Almighty' or 'Praise be to Allah', or a flat-earther colleague insisting I never mention that the Earth is a globe because it upsets them. 4/6
I'll tell you what really might reach the threshold for harassment in the workplace: nagging a colleague to use quasi-religious wording they don't believe in, and complaining and threatening them if they won't. If someone has asked me to pretend to believe in genderism... 5/6
...and I've declined and indicated that I will continue to use ordinary, polite words in an appropriate manner according to the standard linguistic rules of the English language, they should leave me be. That's how we can all rub along: they use their words and I use mine. 6/6