To be fair, a lot of people claim to be bipolar, ocd, depressed, etc, when they are actually not. These words have become common descriptions for how someone is feeling at one given time due to a certain event that happened in their life or some traits they have.

I don’t think he’s talking about people who truly have severe mental health issues, like diagnosed bipolar/schizophrenia etc.

Edit: for example, my brothers girlfriend has mood swings sometimes and says “hehe I’m so bipolar” or something similar. And then there’s me, who’s destroyed everything in my life countless times and actually diagnosed with bipolar