Modern Freudian thought, with its obsession with sex as the key to all behaviour, seems to have begun this current labelling in the 20th century by classifying "homosexuality" as a clinical disorder, and so created a special category for persons so "afflicted." As this was accepted into Western society, then those who thought to indulge themselves such a way were labeled, labeled themselves, as being aberrant in such a way. Until that time, it was recognised as a matter of choice. A person who does this or that is known as one who does- whether the deed is theft or heroism. Old Solomon is quoted to say that even a child is known by his doings, whether they be right, and until the 20th century "homosexuality" was seen as a deed- not a "condition," or a "lifestyle," and surely not a "class."
Is this just a matter of definitions for a biology or sociology class? Hardly! That homosexuality is a chosen behaviour de-demonises those who are or have been involved in it. They are not "weird," "flawed," or "perverted" any more than others who might indulge in, say, drunkenness, gluttony, or shady politics (and how much isn't?). People are people, and the same Gospel is for all people. The kingdom of God is, indeed, closed to "buggars and buggarees [I Corin. 6:9]" in just the same way as it is closed to drunks, adulterers, and murderers, but no informed Christian is going to demand that (merely) leaving a "lifestyle" of any sin is sufficient for anything or, for that matter, even, in itself, an option. The Church is not about demanding morality, but proclaiming holiness. Human beings can produce only a flawed and hypocritical type of morality, but Christ, according to His Gospel, can give us a holiness far above any mundane temptations which shows itself in a love and a joy that surpasses the imagination and, consequently, eternal life.