Perhaps they do. This Straight man made a thorough one-year study of this matter living among Gays because of the continued bigotry against Gays and Lesbians and saw, first hand, that what others were and are saying against them couldn't be further from the truth.
As to whether I agree that homosexuality is completely acceptable, since so many studies have presented good information that there are clear differences between Heterosexuals and Homosexuals that have to do with genes, glands, hormones, plus other data that the ancients in Biblical times could not have possibly known about much less could have had a good grasp of, it leads one to stand up and take good notice, coupled by the fact that Our LORD and Savior Jesus Christ could have spoken out against it had it been such a serious sin but He didn't, and the fact that even God did not include a prohibition against it in His Ten Commandments, and the fact that it is far better to err on the side of caution about these things rather than to act like we are God and condemn these folks outright, how can I in good conscience continue to discriminate against these human beings under the circumstances.