Au contraire. If it wasn't for Joe Rogan I probably would have never gotten interested in bitcoin. It wasn't thanks to him so much as Andreas Antonopoulos appearing on his podcast. He's been on 3 times as far as I know, and each time is awesome. There is not a clearer, more well spoken ambassador to the world for bitcoin than Andreas.
I first heard about bitcoin on an NPR podcast in 2011, but they were so dry and boring about it, all I could think was that it was "nerd money." Who cared? I sure didn't.
Rogan's podcast has become so huge, its now a force to be reckoned with. Its pretty much become a form of mainstream media, despite still being "just a podcast."
Him being a nice guy doesn't detract from the quality of his podcast.
If it had no value, millions of people wouldn't watch/listen to it every week. I mean, the same can be argued for Alex Jones, who I find to be an utter shitstain of a person, yet my opinion doesn't take away from the value that other people find in him.