This is incredibly cheap, and Djokovic's dad is a notorious jerk. Someone mentioned on this thread, but there was a Serbian basketball player, Nikola Jokic at the tennis exho, and he was at a basketball exho, too, where another player tested positive, and Jokic has tested positive now, too. Just because Dimitrov was the guy that got sick first doesn't mean that he was the guy that brung it to the party. And it was a party, which Djokovic organized.
Besides Novak's dad, his coach and tournament director of the Croatian leg of the Adria Tour, Goran Ivanisovic has come out defending Novak. (I mean, of course he would.) But he said something about, well, in 20/20 hindsight we're all smart...except that there was plenty of opportunity and information for 20/20 foresight.
Chris, I think you're right that there's some macho element to all of this, and I mean that rather globally. Kind of "real men don't wear masks." (Which is actually a thing.) Or "real men laugh in the face of danger," or I don't know what. I have a hard time understanding why all of these guys felt like being cautious was not necessary/beneath them/too "girly." Novak asked them all to jump off a cliff together, and they were too butch to say no.