Did John Chrysostom Really Call the Synagogue a Brothel, a Theater, and a Den of Robbers?
~386–387 CE · Antioch · Against the Yahudim / Against Judaizing Christianoi, Homily 1
What the ancient record says
Yes, the language survives in his own homily. He first compares the synagogue with a theater, then escalates: in Homily 1 he describes it as a brothel, a theater, a den of robbers, a lodging place for wild beasts, and a place associated with demons.
Context essential: he preached to Christianoi in Antioch, some of whom were still attending Yahudi gatherings and participating in observances (openly admitted in the homilies); he was trying to stop them, his immediate audience was his own congregation, which does not erase the anti-Yahudi content but explains its use. The homily unintentionally preserves evidence that boundaries were still porous in late-4th-century Antioch (people identifying as Christianoi still attending synagogues, festivals, fasts, respecting Yahudi practices).
He did not attack only the building, his rhetoric extends to Yahudim and their religious life.
Read it for yourself. Chrysostom, Homily 1, Section III (Tertullian Project).
Evidence strength: Direct primary-text. Proven: he used the language; his audience was attracted to Yahudi observances. Not proven: every Christian leader everywhere used identical rhetoric.