Because it defies the very logic of life itself. If you look at life logically, which you keep bringing up, our sole purpose is to reproduce and continue the species. 2 men can't do that which means you are rejecting your genetic programming. That's why I say it a choice, I've tried to understand but logically the is no reason to this.
Now I'm quite happy to accept its your choice and everything but don't tell me that life would manipulate itself genetically to defy its very sole responsibility to continue the species.
That there is a purely logical assumption, logic which you keep throwing in my face. So logically this is either a choice or genetics has decided that your genes are not worthy of continuing the species (no offence or insult was implied).
I'm sorry if this offends you but you keep telling me I'm wrong so I'm defending my believe.
So by your reasoning, people who are born sterile don't really have a "logical" purpose on earth. Or Asexuals. That is terribly disappointing for them.
Also, you speak of genetics as if it's some sort of sentient decision-maker. Genetics determine a lot of things - eye colour, skin tone, indeed, probably even sexuality - but "it" is certainly not making any sort of "decision" about who is "worthy" of reproducing.
Also, thanks to science, gay men and women can reproduce - in a genetically viable way - with the greatest of ease. So yeah, there goes that.
If you want to know why you're rubbing people up the wrong way, it's because you're telling gay people that they're "choosing" to be oppressed by idiots, and need to, you know, deal with it because it's your choice.
Have fun telling the numerous lesbians who are being "raped straight" every day, that they chose to be that way and have to deal with the circumstances. Have fun telling all the gay teenagers who are killing themselves by the truckload all over the world because they're being bullied to that point because of their sexuality. It definitely sounds like something people want to choose.
Homosexuality isn't a choice, I'm afraid. Having a misinformed opinion, however, very much is.
Unfortunately you also can't go "I accept that it's your choice, so you have to accept that it's my opinion that it's your choice" - that is the most ridiculous argument.
You have the right to think whatever it is you want to - but you cannot express an opinion as fact, and then go around thinking it's sacrosanct. Especially when it's pretty much completely baseless. By telling gay people - who are stating unreservedly that it was not a choice to be gay - that you believe it's a choice and you don't care what anyone says - you're in effect saying you know gay people better than they know themselves.
That's pretty insulting.