I would generally leave this one alone and allow my esteemed NFL writing colleague Peter King of Sports Illustrated battle it out on his own. 
But PK, who took a shot at Jets' fans in his Monday Morning Quarterback for not showing up in droves for Brett Favre's preseason debut on Saturday night against the Redskins, poured some more gas on the fire with a retort to the fans' criticism of his take.
I'll leave you to make your own judgements.
I will say two things on the subject, however.
1. I would never criticize a fan for not showing up to a preseason game, even if he/she has already paid for a ticket. The games are meaningless, people's time is valuable, and if there is something better to do on a warm summer night than drive four hours round trip, spend $60 in gas, another $100 in food and other expenses - especially in this economy - then it is that person's right. Regardless of whether it's Brett Favre or Joe Montana or Johnny Unitas. To question his/her loyalty to the team over not showing up is simply not an issue.
2. I very rarely get into bashing fans, because without them I would be doing something entirely different with my life and, I daresay, something far less enjoyable. The only time I do criticize is when their behavior at games is vile, dangerous or otherwise inappropriate. Case in point: When Chad Pennington suffered a sprained ankle in the regular season opener and lay on the field, you could hear several Jets' fans actually cheering. Now THAT was a disgrace.
(And, by the way, it is not my intention to get into a war of words with PK, whose friendship and work I have enjoyed immensely over many, many years. This is all about fans and preseason games.)
You can return to your regularly scheduled programming now.