I've always been frustrated because I actually quite like him and think he has been unfairly treated at times. The Australian Open social media oppos have sometimes acted like a Fedal fan account and that has felt disrespectful when you consider Djoko is their record holder. I loved his tennis in 2011 even though he was beating Fed.You're right, it was around 2015. A few things changed between the young Djokovic (who came within a few votes of knocking Federer off for FanFav in 2011 IIRC) and the later version:
- Started playing more conservative "boring" tennis. Young Nole was much more of a pure aggressive baseliner from the Agassi/Safin school. Over time he became more serve-reliant and content with waiting for errors.
- Started beating up on Federer consistently. Before, it was more of an even matchup and Djokovic would always need to play his heart out for his wins. Then Fed got older and Djokovic got more confident against him.
- Toned down his off court personality to become more PR-friendly. The public got to see less of the unfiltered off-court Djoker.
There were still times after that when he was just as revered as the other 2, though. Especially during his 2018 comeback. I think W18 was truly a high point for him and everyone involved.
But last couple of years I've just got tired of the unpleasantness of his father, the weird paranoia of a few of his fans, the obsessive gloating over 40/15. These things shouldn't affect your view of a person but in the end they probably do.
On the good side, on another tennis forum someone started a thread saying that as a Novak fan he'd expected Fedals to make his life a misery the last couple of days but wanted to thank them for being classy. I thought that was really nice. And a lot replied that they'd actually quite wanted to see history made even though it would have given Novak the record. Maybe we'll all start being a bit kinder.