It is. It's called "bi-polarity".
No, it's called different people disagreeing with each other.
The issue here isn't bipolarity, but rather that some view this forum as having 2 people: themselves and "The Other". When "The Other" writes something, people don't pay attention to who is writing it, it's just "The Other" and then they are confused why "The Other" sometimes has one opinion and other times has another.
This is particularly so because one side or another will be more vocal, depending on whether the facts support them. If Kreider plays poor, those who say his AHL performance matters will be more vocal. If he plays well, those who say he's more fit for the NHL than lower levels are more vocal. But these are different people.
To view everyone else other than yourself as one person is not only ignorant, but very arrogant.