I've noticed that I can sniff out pretty quickly who is actually interested in what's going on and is willing to learn things so they can fix it the next time. (Hint: these people also tend to appreciate your services).

It's the remainder - the Idontfuckingcarejustgetitfixed crowd - that ends up with my disdain and condescending feelings after a time. You know they'll never learn, they'll never care to learn, and you're just an obstacle to whatever is waiting on the other end of that Powerpoint or Farmville run.