Japanese.

I think it's more the gushing weeaboos than anything. They killed my interest. I don't think the language is any better or worse than any other, but when people start talking about how Japanese do everything better, how Japanese is so much prettier than anything else and how they have wet dreams about moving to Japan to teach English, the bloom goes off the language for me.

I'd rather learn Russian or Bosnian or something. It sounds cool, and the fans are less annoying.