There is variation here in how much of one's emotional life is affected by the Dolphins' performance, and for the people whose lives are affected a great deal, there is likely an inherent bias toward seeing the glass as half-full when it comes to elements of the team that are strongly correlated with winning (i.e., quarterback play) but are currently at least somewhat ambiguous.
When the "glass is half-empty" statements are made, those people tend to react viscerally, since they're also likely to be people who have insufficient interpersonal boundaries to feel comfortable thinking whatever they think while other people think something else.
