I'll add to this list...

"You can't possibly be bipolar. You're so productive/successful."

This is very dismissive and invalidates the individual's experiences and suffering. It's the response I had gotten most often with ADHD and depression. Just because I'm mentally ill doesn't mean I can't be successful, for cryin' out loud!

It's actually been easier with the bipolar diagnosis. Friends who know me well tend to say, "Oh, that makes so much sense!" because it explains my behavior and my productivity. But I haven't told enough people yet to run into many negative or condescending responses.