They actually have really good fans. I don't get the self-righteous bit. I'm not sure what he's talking about. He's American too, so it's not like he's in Germany interacting with BvB fans all the time. They seem like a respectful, decent club. Klopp doesn't spend his time making outrageous and stupid statements in the media like a Garcia or Mourinho. I guess they're a "football hipster" type team in terms of who supports them, which can be a bit irritating, but quite a few clubs have experienced that at times.
I'm a little bitter still about the 97 Champion's League final, seeing as Juve outplayed them in the match yet somehow couldn't finish chances, while Dortmund finished all three of theirs. But not a reason to hate them.