I saw something on the internet in which this actually happened to someone and wanted to say what you should do in this kind of situation.

If you have a mental disorder (like schizophrenia, bipolar disorder, depression, etc.) and you're with some idiot who finds out and says (just thinking of an example), "I can't hang out with you anymore. I don't want to catch schizophrenia."

If that happens, just give them your most judgmental look, and say, "Oh, I'm glad you said that. I didn't want to hang out with you anymore. I don't want to catch stupid."