I think they were probably stroking Bob. Here's the clue:
" "Every hand has a mathematically correct play. Let me ask you some basic ones," I said. "How would you play A♠ Q♥ J♣ 7♦ 4♣?" I knew the correct choice was QJ, but many DDB players hold just the ace. Occasionally some players without a clue hold AQJ. "I'd throw them all away," Marge announced.' "
Come on. Who throws away an Ace? It just screams high card right at you! It's mostly white, has one pip, and has a big A on it in case you were in doubt. You can spot it a mile away. It doesn't look like any of the other cards.
The problem is, where's the EV in disclosing to a guy like Bob that you might be a threat? Better to dummy up, maybe he'll advise marketing to increase your offers. In any casino you want to be known as the village idiot, not almost as smart as Bob.
If Bob asked me how to play this hand I'd say "throw them all away", like Margie here, you go girl, but then on second thought, hey there, you've got some face cards in there, doncha wanna keep some of those? I'm just saying, yah know, these days you can't be too choosy. Say, have you tried the buffet yet, the cheese balls are to die for, I mean they are to die for, yah know? Love your choice of shirt, it just screams winner! But hey, maybe next time consider an undie with it, yah know?, I'm just saying. In these high pressure situations you can never know when your underarm protection can give out, yah know?
Grosejean presents the ideal "casino look":
https://www.youtube.com/watch?v=uRt377iIN4E