One of the new-found "fans" of the Boston Red Sux who has limited to no knowledge of the game of baseball, and who buys expensive and scarce tickets to the ball game because of the frat-party like atmosphere, and so he or she can brag of their allegiance around the water cooler. The pink hatter is so named because their team apparrel purchases are unconventional in color, and are merely chosen in an attemp to call attention to themselves and their amplified hipster factor. Pink hatters can be found in the ballpark taking the seat of a more interested and less casual fan that was unable to get a ticket.
Did you see the movie Fever Pitch where Drew Barrymore gets hit in the head by a baseball at a game because she is using her lap-top computer? That scene was meant to be humorous, but it made light of the serious problem of the confluence of pink hatters to Fenway Park. Geez, bandwagon fannery has certainly gotten out of control.