[BradyLS]

I haven’t heard Levin in ages. But I’ve heard hosts that have summarily hung up on callers with disgust when they suddenly (via non-sequiter) change tack a topic that they did not call about.

Callers that suddenly change the topic of their call without warning typically have an agenda and a specific question, point, or piece of information that they want broadcast to the audience. In some cases, they might have gotten their shot with the help of the host —if they were honest about what they were going to talk about with the screener and it was put through to the host.

[conservative98]

Levin doesn’t put specific topics on the show. Unless you’re black or have an accent.

[AJFavish]

But I’ve heard hosts that have summarily hung up on callers with disgust when they suddenly (via non-sequiter) change tack a topic that they did not call about.
I agree with you. However, when I listen to this particular clip, it is clear to me that Levin is reacting much more to the substance of the subject itself, rather than to the fact that there was a change of subject. Usually when he is upset about a change of subject he says that is the reason for cutting the call short. He did not say that here.