He's white and he does well on the field so the NFL won't care. He's also lucky he's big, quick and can catch, but all that partying catches up fast and he'll burn out and end his career soon but I don't think he cares. If he was a gymrat he might be the GOAT of all receivers but he isn't planning for the long term.
He parties in the off-season, who cares. By all accounts he's focused on his craft during the season. It's the accumulated injuries that'll end his career early, nothing else.
A healthy Gronk in his prime is far and away the best TE to ever play, no player heretofore has managed to excel at both blocking and receiving the way he has. But it's incredibly unlikely that he'd be able to match the incredible longevity of Gonzalez or even Gates, and neither of them were half the blocker Gronk is