Sin as a word and a concept have become innocuous and even acceptable to man today. Of course the real problem is that most people have no idea what sin really means. This is part of man's blindness and ignorance of the truth and their alienation from God.
The word "gay" has provided a lie and deceit for man and society to accept sin as inoffensive and acceptable. As deceit it covers up the truth allowing evil and unnatural behaviour to be received as "normal" as subtle as Satan was in the Garden.
Sin itself has power and control over man and therefore he will not make the right choice or decision morally on this issue. The power and influence of sin is subtle and insidious in man and supports the work of Satan and the principalities and rulers of darkness (Eph 6:12). Spiritual wickedness is our enemy and our conflict in this life.
Man therefore is ignorant and blind (Eph 4:18) in the vanity of his mind. So you can preach to most people and they cannot receive the truth any more than they can receive God Himself.
"John 3:19 And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil." ### That makes LGBT acceptable in this fallen world.