The same Church that teaches and believes that, "Homosexuality . . . has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on Sacred Scripture, which presents homosexual acts as acts of grave depravity, tradition has always declared that homosexual acts are intrinsically disordered. They are contrary to the natural law. They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity. Under no circumstances can they be approved," and, "This inclination, which is objectively disordered," and, "These persons are called to fulfill God's will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition," and, "Homosexual persons are called to chastity. By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection."
So your stance is solely based on if having same sex desires and acting on them "is a bona fide mental disorder", not the fact that it's an extremely harmful and unnatural act that God abhors?
No, having the proclivity is disordered. SSB, as mentioned above, are, "acts of grave depravity," and, "Under no circumstances can they be approved."