The sin of Sodom was actually the sin of inhospitality?
This is a common error made by supporters of homosexuality. The problem with this explanation is that it does not account for the offering of Lot's daughter to the men outside the home, a sinful act indeed, but one that was rejected by the men outside who desired to have relations with the two angels in Lot's home.
Gen. 19:5 says, "and they called to Lot and said to him, 'Where are the men who came to you tonight? Bring them out to us that we may have relations with them.'" Those men wanted to have sexual relations with the angels who appeared also as males. Does it make sense to claim that God destroyed two cities because the inhabitants weren't nice to visitors? If that were the case, then shouldn't God destroy every household that is rude to guests?
Gen. 18:20 says that the sin of Sodom and Gomorrah was "exceedingly grave." Not being hospitable to someone has never been considered an exceedingly grave sin, especially in the Bible. But, going against God's created order in violation of his command to fill and multiply the earth in the act of homosexuality is an exceedingly grave sin. In fact, we know that it is exceedingly grave because in Romans we read about the judgment of God upon the homosexuals, in that he gives them over to the depravity of their hearts and minds. This is a serious judgment of God upon the sinner because it means that the sinner will not become convicted of his or her sins and will not repent. Without repentance there is no salvation, and without salvation there is damnation. Therefore, the argument that Sodom and Gomorrah were destroyed because they were not hospitable carries no validity.