Now that's a big embarrassment to him.
I'd rather stay silent in place of meeting no matter how knowledgeable I am than run my mouth letting out nonsense just to prove a point or show what I'm not. Naturally I'm not even the type to talk much in a meeting except I'm called upon to say something. People who talk too much especially when they aren't asked to are always empty vessels trying to prove what they are not.
Being a good conversationalist takes effort and understanding, it also takes the right body language as that forms a very large part of communication. People like the person I mention in this post generally are not good conversationalist, but they think they are. It's best to remain silent than do what this character did.
Thanks for your comment, I appreciate it greatly.
Very important, to know when to begin and when to stop.
True, to avoid embarrassment.