I certainly wasn't attacking him.
There's no difference now in the ratios of straight/bisexual/homosexual people than there's ever been. We've just been through a period of human history where people have had to keep their heads down about that sort of thing, largely because of the influence of monotheist religions.
Many countries are still in that period, and many of those still have capital punishment for same sex relationships. There's no reason to believe that they have different ratios than any other nations.
In ancient Greece and Rome bisexuality was rampant so if sexual orientation is entirely inborn it wouldn't explain why there was a lot of bisexuality back then while there isn't as much today.
Homosexuality was encouraged by the Greek, Roman and Spartan armies. Soldiers were put in pairs, and ordered to have sex with one another, whether they naturally swung that way or not. The logic was that in battle, they'd go the extra mile to protect lovers.