Quoted for posterity:
45 minutes into the event, McCain called on a man who asked a question that included a four-letter word. Here is the audio (mp3 runs 35 seconds) . Here is the transcript:
“Yes sir. Yes sir,” McCain said, gesturing to the man he had called upon.
“This question goes to mental health and mental health care,” the man began. “Previously I’ve been married to a woman that was very verbally abusive to me. Is it true that you called your wife a xxxxxxx?”