Since it's coming from a closer who never met a prickly quote he didn't like, we'll have to consider the source. But Wagner's issue, according to the NY Daily News, was with other teammates ducking questions in the postgame locker room while leaving other teammates to answer for them.
From Adam Rubin:
(Wagner) looked over toward the area of Carlos Delgado’s locker and blurted: “Someone tell me why the (expletive) you’re talking to the closer. I didn’t even play. They’re over there, not being interviewed. … I got it. They’re gone. (Expletive) shocker.”
At 20-19 and only 2.5 games behind the Marlins, the Mets could be in a much worse position. But lose 4 of 7 in a homestand against two last-place teams in the Reds and Nats, and you can see where things might start to get a bit testy. Willie Randolph has some work to do.