Another question, can you be metzaref them to minyan?
My daas baal habayis would say we should go l'chumra on both sides...
But halachally speaking, what is the source of the isur on shaking hands with the opposite gender? We could probably extrapolate from there if it would apply.
And would it make a difference between AFAB/AMAB when it comes to opposite gender shaking hands ?
I think its pashut they are metzuref.
The source, for those that hold its a problem, would be לא תקרבו לגלות ערוה.
This person was with another individual who I was genuinely unable to determine their gender. Was terrified they’d attempt a shake and my trusty “sorry I can’t shake hands with women”would be useless because what if they were actually, or identified as, male.
Thankfully it did not play out.