I'm neither arrogant nor ignorant, thanks.
I still don't believe the majority of homosexuals choose to be homosexual, nor do I think the majority of heterosexuals choose to be heterosexual.
I think people who believe this are kidding themselves.
Sure, some people do make a choice to end or enter *a relationship* based on personal opinion or expectation regarding their sexuality, but I don't think they choose their sexuality.
I could choose to marry a man tomorrow but in my own opinion, I'd still be gay; if I'd chosen to marry a man though, society would perceive me as straight.
Of course there are exceptions to every rule.