I once got told to shut up in Chemistry class because of this. I'd been reading books on quantum mechanics on my own, and so when the chemistry teacher presented the Niels-Bohr illustration of the atom on the overhead screen, I asked how it related to the quantum mechanics view of the atom, did the atom actually look like the illustration she'd provided, and she told me to shut up and stop asking questions.
Wow, that sucks :( What a crappy teacher. It's one of my favorite things when a student has enough interest in my class to learn about it outside of school and then share it with me. I love it when they bring in crazy new stuff to talk about. Granted we sometimes double-check with a quick google search, but it always generates interesting discussions either way.