I had similar experience with other company, answered 2 coding and 1 design question in 30 mins. We talked for 15 mins, got rejection later. though how did you deduce that he had problem with your inquisitiveness ?

Lol. I know the reason. You just didn't pretend to be like "OMG, I've never seen this question before". You were just too straight forward. Code monkey isn't smart. Keep that in mind.