>I'm not entirely sure how I feel about this. One the one hand it's a podcast targeted toward men, which I'm fine with. On the other hand, his whole thing is about open-mindedness so it doesn't seem quite right for him to almost exclusively hear the views of men on his show.

What are you not sure of exactly? Also, his guests are also picked via audience polls, someone writing in, or via random twitter interactions, etc.

In any case my point was that if you say "this lacks diversity" its you who has to actually bring the data. Expecting someone else to dig up the data to prove your point would be a bit odd.