No that's not what I said. I said you're born straight or gay. That said even if being gay was a choice IT WOULDN'T MATTER because consenting adults can do whatever they want with each other.
As a bisexual person you don't need to try and make out I'm being homophobic thanks. That's a very disingenuous reading of my comment.
Believing environment has no impact on what you find attractive is ludicrous. It's a mixture of biology and environment.