I don't think you should have to play down the fact that you do know more and that quite likely your gear is better. Most people understand that, that's why they are asking you! You don't have to play equals or be buddies or a peer in this respect. You do know more about the topic, so own it! If you have information to share, they will appreciate it. If they think you sound like a know it all, they won't ask you again. Big deal! If they say, "what does that mean?" then you simply say that the camera needs to take very fast picture to capture the action... and that in order for that particular camera to get up to that speed it needs to a) be very sensitive to light (ISO) b) have the lens opening as wide as it can to let the most light in so it can snap very fast. These sorts of things are not accurately captured with fully automatic or "sports mode" shooting, that's why they are not seeing results they want. The reason why their photos turn out dark/blurry is because the lens is closing down so it can "see" farther (at which point I demonstrate a triangle/field & depth of view with my hands... hey, if I can understand it that simply, they can, too.
I actually really liked the Rebel EOS online tutorials... not sure if I can post a link here or not??
Anyway, my point is, don't play down your knowledge. Anyone who is offended or intimidated by it should just suck it up. lol