Being bipolar is a serious disorder, one that should not be made fun of.
That being said, I laughed so hard when I heard a group of people describe their boss as a bipolar bitch. It is sad when everyone notices a person's shortcomings except for that person and the one who put that person in charge. I know I shouldn't have laughed. This person can't help being disabled but one wonders how a person with this severe disability (without obvious any meds being taken to correct the behavior) can be put in charge of anything.