You gotta fight for your right to party ... and apparently, Rob Gronkowski didn't earn that privilege after getting drafted back in 2010 -- revealing the Patriots were SUPER pissed at him for celebrating on stage during his big night.
The future Hall of Famer detailed the hilarious interaction with his new team just minutes after they took him with the 42nd overall pick ... saying they called him amid his family's passionate huddle and told him to cut it out.
"They said, 'Hey, Rob.