But the answer of his people was not except that they said, "Expel the family of Lot from your city. Indeed, they are people who keep themselves pure."
يَتَطَهَّرُونَwho keep clean and pureyataṭahharūna
Tafsir
But his people did not have an answer besides their saying: “Remove the family of Lot from your city. They are a people who want to stay pure from dirt and impurity”. They said this to mock the family of Lot who would not join them in the immoral acts they used to commit, but rather they would condemn them for committing them.