The complaints I've seen about people learning ASL have been directed at those who ALSO say "I WANT A DEAF BOYFRIEND LIKE EMMETT!!!!!! OMG!!!" and other over the top stuff like that. Which frankly if that's the only reason someone wants to learn sign language than please, don't!

On the other hand if you honestly want to learn ASL, please do! I'm hoping one of theses days High Schools will allow ASL as an alternative to the other foreign language requirements.