The Lord appeared in the form of a man to Abraham. accompanied by two angels, also in the form of men.
Abraham bargained with the Lord to save Sodom and Gomorrah for the sake of ten righteous people. But, there were not ten righteous people found. However, God did save Lot and his two daughters.
2 Peter 2:7-8
and if he rescued Lot, a righteous man, who was distressed by the filthy lives of lawless men (for that righteous man, living among them day after day, was tormented in his righteous soul by the lawless deeds he saw and heard)
The people of Sodom and the other four cities engaged in any evil perversion imaginable, homosexuality, pedophilia, adultery, fornication, rape, torture, and murder, to name a few.
This city was definitely "sin city".
Before we become believers in Jesus we are dead in our sins. We are citizens of "Sin City". Once we become believers in Jesus Christ as Lord and Savior we are then citizens of "The Kingdom of Heaven". Shouldn't we live then as if we are citizens of the Kingdom?