I apologize if this has been said already...
The problem with the fans in this type of situation, is that many of them mistakenly believe that they know what they're talking about. They say their team is going to win, and they do, repeatedly, not because they have any wisdom or insight, but because their favorite team happens to be very good at that point in time. Those fans get a bit of an inflated opinion of their own opinions, and attempt to speak intelligently about other teams and players. This is usually where people get annoyed, because those fans are still right a lot, because they are still
mostly talking about their favorite team, not in the fine details, those are usually still off, but with some creative logic, those opinions can usually be retrofitted too.
They especially annoy those of us who do really know what we're talking about.

, but we'll live with it.
This doesn't explain Chase Stuart (aka JetsFan), but not much does.