Slightly different angle, but one thing I've noticed is that no one is above generalizing and stigmatizing. This goes for mental health professionals as well. Let me explain.

I am a psychiatrist who also happens to be bipolar. Upon finishing med school and applying to residencies, those privy to my situation encouraged me to avoid any reference to my diagnosis. I had no intention of ever bringing it up, nor is it any of their business, but the mere fact that people pointed this out to me demonstrates just how prevalent stigma is, even amongst those who claim to be fighting it. Many people will cite their experience with, say, diabetes as influencing their decision to pursue a specialty in endocrinology, yet when it comes to mental illness -- even when it's well controlled -- any indication automatically robs you of your credibility. I've joined coworkers in many anti-stigma walks and campaigns, but if you ask any of them if they would admit to having a mental illness, most would call you crazy.