"It is part of your symptoms"
"Well we do hear of other patients doing that too"
"Did you ever think about us when you're feeling down?"
"Take your meds, you'll feel better."
"Patients this.. patients that.." (I am a patient, yes, BUT IM ALSO HUMAN PLEASE DONT INVALIDATE ME D: )
"Just be happy!!!" (if it was so easy to be happy, there won't be such thing as depression. We'd all choose happiness)

And the classic...

"there's no such thing as mental illness. you're just weak. just be happy!"