Thanks to the wonders of TNT's cameras, we got a chance to see the Atlanta Hawks' huddle before a pivotal inbounds pass with 3.1 seconds remaining of Game 6 against the Boston Celtics. Normally, with a team's season on the line, the players are fully attentive.
For those not interested in watching the whole thing, here are some screenshots.
To be fair to Smith, there were periods where he was peering in attentively, and he could just be a better listener than we think. The entire team also looked kind of confused throughout, not just Smith.
Still, this video and these screenshots seem to illustrate why Smith has a reputation for being tough to coach.