Yours is an interesting reply in context, because his reaction is not one of dismissal, but of exhaustion: he didn't get anything out of the meetings to pick his brain. The person asking very well may have.

I'm guilty of the 'let me pick your brain.' And your advice, which is directed to me, is spot on - and I'll take it seriously. But the true wisdom lies in the depths of it: treat everyone like their human. Don't exhaust a man just because he's successful.