I think Freepers just generally don't like when any individual or group supports or excuses things which they know to be wrong.
"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." "This inclination... is objectively disordered"
(Cited: Catechism, Para. 2357-59 (Link).)
So the inclination, though it is not a sin in itself, is "objectively disordered," and the conduct is a sin which under no circumstances can be approved.
If you find any Catholic going against that, let me know and I will go after them hammer and tongs. OK?