I would personally call them men every single time. But I don't want to be deleted.
I believe mumsnet's last announcement on the issue, was you can say they are men, as a concept, but constant misgendering is a bit off.
I often find I have written a paragraph that says they, he and she!
Sometimes depending on the context. So if I'm furiously reacting about their maleness, I will, quite automatically, say hey. If it's more general I might say she.