Put aside, for the moment, the double-speak of believing that homosexuality is a sin, and allowing–or forbearing–it openly. One of the whole obstacles to liberals understanding conservatives in the church is that liberals want conservatives to act like good liberals. They want us to accept liberal presuppositions. One of those presuppositions is inclusiveness. Conservatives do want to be as inclusive as the New Testament, but we also understand there are some exclusionary principles as well. For example, those who do not trust Christ do not go to Heaven, based on John 14:6. 1 Corinthians 6:9-10 also speak of those who formerly practiced gross sins, and would not have entered the presence of God if they remained in their sins, and now have been saved from those sins.
Liberals have tolerated conservatives–and you might want to check how much conservatives have been tolerated (it may not be really as much as you believe)–because it is a liberal value to be inclusive. To exclude us would go against a liberal core value, and be perceived as “intolerant.”
Apparently it is a conservative core value to be intolerant.