That gets us back to the trees growing. They do not choose to grow - they just grow. Homosexuals do not choose to be homosexuals - they just are. Homosexuality is a feature that comes with those individuals - it is not an opinion or a position, hence it is impossible to disagree with it. You can disagree with views, opinions, positions, teachings, theories, hypotheses, etc. etc. but not with people's immutable characteristics. It is like my cat Tommy is all black - he is all black. It is a fact of his existence. It is not his view or opinion or choice or statement or manifesto - he just happens to be all black. It is not my view or opinion on him either.

Should black cats be fed as much as Maine Coons? Should homosexuals have equal rights to marriage as heterosexuals? Those are questions that different people would have different answers to and we can agree or disagree till the cows come home, but we cannot disagree with the existence of black cats or homosexuals.