How often does someone mention a mustache or facial hair on a woman, or an adam’s apple on a woman as a sign of them being a “butch” lesbian?
How often does someone make a comment about a man's face perhaps looking a bit feminine?
It is not hard to find Freepers who use PHYSICAL characteristics (Which are obviously, and by definition, hereditary) to call someone “gay”.
Gays often cite the claim that it is genetic or something they are born with as the last word on the subject, but there are many other conditions about which the same claim could be made which are nonetheless universally considered to be undesirable: genetic defects, alcoholism, pederasty, certain kinds of psychological illness, etc.