I use the preferred pronouns of transwomen who are on the forum in threads if I feel a need to be polite, as in this case, they actually can read it.
Fortunately, the issue has not come up in real life, but I would probably use their name and "you" when talking to them, and use the correct pronouns according to sex when talking to my terfy friends. (And all my friends are "terfs" as they don't believe that men can be women)
How do you feel when someone asks for your preferred pronouns? I find that rather offensive. It is like they are expecting me to be delusional.
I mean, no one walks around asking people whether they identify as Napoleon or more as the Queen of England.
No one even asks children whether they have an imaginary friend!
I can live with it when it is on gatherings or trans people, but it is done at feminist events that should have nothing to do with trans. (Though admittedly, there ARE a lot of transpeople at liberal feminist events.)
And even in completely normal environments where the likelihood that anyone "identifies" as anything is quite low.