> trans men (male-to-female)

trans men (female-to-male)[1] trans women (male-to-female)[2]

[1] https://www.dictionary.com/browse/trans-man [2] https://www.dictionary.com/browse/trans-woman

> I think what OP means is that if a lesbian declines sex with a trans women (male-to-female) on the basis of the latter's assigned gender at birth (male), the former is marked as a transphobe.