Fred Taylor is LIVID over Tony Boselli being named greatest Jacksonville Jaguar of all-time over him ... going scorched earth on social media and calling the list "a joke."
Fred famously played 11 seasons for the Jags from 1998 to 2008 ... and clearly felt he'd be named the franchise's best player ever when the team's website released its list this summer.
But the Jags gave the No. 1 overall honors to legendary left tackle Tony Boselli ... leaving Taylor at the No. 2 spot.
When Taylor got word of the snub .