In the same ayah, we have learned about the acts of the nation of Lut A.S. and their persistence and why those acts were put in the category of ٱلْفَـٰحِشَةَ.
The next section of the ayah encloses the response of the nation. I recall the response of the nation of Ibrahim A.S. when he preached the message of Tawheed. His nation tried to punish him so that they would stay on kufr, but the nation of Lut had a very different response.
The ayah says:
فَمَا كَانَ جَوَابَ قَوْمِهِۦٓ إِلَّآ أَن قَالُوا۟ ٱئْتِنَا بِعَذَابِ ٱللَّهِ إِن كُنتَ مِنَ ٱلصَّـٰدِقِينَ
So, the answer of his nation was nothing except that they said, 'Bring us the punishment of Allah if you are from the truthful.
Lut A.S.
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