As for how you were treated - I don't think the low-key introduction can be fully blamed. The VIP should have known that smart people exist in various places around the world, and sooner or later one does bump into them. When you meet someone knowing absolutely nothing about them (and an introduction doesn't count), and then they start talking intelligently about a topic, then you have one data point (that they have talked intelligently), and you should draw an appropriate conclusion from that. It sounds like the VIP had serious preconception issues.