Retired NFL star Steve Smith is taking Titans QB Zach Mettenberger to task for that gameday selfie he took before taking a loss against the Texans.
Mettenberger's been getting blasted by fans and players for the Instagram of his new haircut -- hours before Sunday's kickoff ... his first start, by the way. Smith says the kid needs to be more like his ex-QB, Eli Manning.
Smith was shopping in Calabasas when he stated his case ... and it's a good one. Ever seen an Eli or Peyton Manning selfie? Exactly. And Steve's got hardware to back up his argument.
Speaking of which ... you gotta see Steve's jab -- at his OWN Super Bowl ring! Michael Strahan would not approve.