Earlier quoted context omitted.
It is completely appropriate to enforce a trans-affirming policy. A view that considers a group of people -- other people that participate on the site -- mentally ill, has no place in workplaces, large-scale online forums and polite society in general.
I'm not among this group we speak of, but I will never accept that view of them. They are not malicious, they are just different, and we should be tolerant of them even if they are not tolerant of transgenders.... in the same way that we are tolerant of Islam even though Islam is not tolerant of women's rights. I consider them (Christians) to be mentally ill what with all that christian god stuff they preach. Do you…
Yes, a view that all Christians are mentally ill has no place in workplaces either. This does not mean that you cannot privately hold such views, but that you should not act in the workplace in ways that show you hold those views (so you should not misgender a trans person, for example).