Except for a few exceptions like Nadal who don’t break/throw racquets, the majority of professional tennis players behave like jerks on-court when they are losing or playing poorly. This sets a bad example and most junior players behave like this also. So, Djokovic deserves criticism for all his unsportsmanlike behavior, but let’s not single him out for this as he is just a reflection of the poor standards of sportsmanship displayed by serious tennis players since the days of Connors/Nastase /McEnroe. Tennis has long stopped being a sport where players were expected to behave like gentlemen and ladies. Maybe, this incident will cause at least some players to behave better and set a better example for kids.
I was a big fan of Sampras because he was a throwback in terms of how he behaved on court and he set an example for me about proper on-court behavior from someone in my generation.