In many organizations, having a lot of knowledge about something that someone else is supposed to know more about is a good way to make them feel uncomfortable or in extreme cases dislike you.
This. I worked for one org (USMC) where I was a young(er) worker, with more knowledge about our job (micro-computers, LANs) than most of my superiors. And this was okay. Encouraged, even. My lieutenant's job was to lead a team, not be a know-it-all.
Then I stepped into the civilian world and found a majority of managers were freaked out when their juniors knew more than they did.