JazakhAllah khair for the comment.
Nowhere is it acceptable in either the Quran or in the Sunnah of the Prophet PBUH to any innocent women of prostitution, whether singly or in groups. Such accusations levelled at groups of people are no different than those aimed at individuals.
“Verily, those who accuse chaste women, who never even think of anything touching their chastity and are good believers, are cursed in this life and in the Hereafter, and for them will be a great torment” [an-Noor 24:23]
This refers to every chaste woman that is not known to have committed zina and this definition is accepted as such by every theological school universally. At-Tabari RA specifically defined chaste women as those who refrain from zina and are believers in Allah.
This guy's words were "There are high rates of prostitution among somali women in places like Atlanta and other places" - meaning out of all of the Somali women in Atlanta, but many of them are prostitutes. The burden of proof now falls on him to prove that what he said is true. He is being called out on not having statistics, let alone witnesses - if he cannot back up what he said, he needs to be held accountable.
Furthermore, in addition to being lashed for slandering a chaste women, the testimony of such men is expressly forbade from being listened to or accepted for the remainder of their lives. This is from the Quran itself.
Slander is considered a "hudud" offence (from the Arabic word meaning "boundaries" or "limits" - it cannot be pardoned by the individuals involved or by the state. This is a crime that goes directly against the Word of God as it crosses human limits into the domain of the Almighty.