It is not even unsportmanlike conduct, not defending Djokovic, but he should have been given a code violation first.
The rule book leaves some room for interpretation actually:
Q.PHYSICAL ABUSE
Players shall not at any time physically abuse any official, opponent, spectator or other person within the precincts of the tournament site.Violation of this Section shall subject a player to a fine up to$20,000 for each violation. In addition, if such violation occurs during a match (including the warm-up), the player shall be penalised in accordance with the Point Penalty Schedule hereinafter set forth. In circumstances that are flagrant and particularly injurious to the success of a tournament, or are singularly egregious, a single violation of this Section shall also constitute the Major Offence of “Aggravated Behaviour” and shall be subject to the additional penalties hereinafter set forth.For the purposes of this Rule, physical abuse is the unauthorised touching of an official, opponent, spectator or other person.
Source: https://www.itftennis.com/media/2495/grand-slam-rulebook-2020-f.pdfThe problem is, that other players were disqualified for similar things (Shapovalov, Serena, Nalbandian), so it would be very weird to not dq Djokovic for it as well, i.e. give him some super star bonus. The incidents in the past set a line and now it's very difficult to lower the line again, though I would support it. Just give point/game/set penalty or whatever plus a
huge fine.
It's a pity that an already suffering tournament has to disqualify the biggest player still in the draw for this, but otoh it makes the outcome much more interesting now
agree that it is a pity, but rules are set so should be respected, it is clear that it was not intentional, it was even not the anger since this was not the moment when the anger should come out, it was already out, so just bad luck for him at the moment, he should have win this one, but next year probably
nevertheless, now the tournament is getting really interesting, since there is no player with grand slam already won in the draw, and for all this will be the first one, think that Zverev chances are now best, he is suffering with top three, but when they are gone, his motivation could lead him to the title