As a clinician it is extremely frustrating to me the frequency that people with bipolar disorder get misdiagnosed or the clinician simply stops a "bipolar" when there is also PTSD, anxiety etc.  OR when a person has bipolar disorder and substance use and the clinician chalks all the symptoms up to either intoxication or withdrawal and fails to take a thorough clinical history!  And my final rant is when the expectation is for people to be "normal"  or "happy" between episodes.  Most people, including clinicians don't understand that there is still a lot of mood fluctuation even between episodes.