A persons sense of humour is directed by their culture, age, and education. I don't believe it has anything to do with whether they are authentic, (I don't really understand what you mean by authentic), or sincere.
I find much of american humour quite unfunny, a 4 year old will find things hilarious, that leaves most adults cold, its all relative.
What was the book that Paxton was holding in his hand throughout his lecture? It looked well thumbed, and not the least bit burnt.
I get confused when the energy does not match the actions or words. Although very interesting, Mr Robey's words, for me, did not match the energy in and around him, hence my confusion.