What does "ricipocol" mean?
Anyhow, asshole and head-case aren't the same thing. There are plenty of assholes who aren't head-cases, and the reverse. And then there are some who are both. Even if Tsitsipas is an asshole, he doesn't seem a head-case. In fact, part of his promise is his mentality and ability to fight through and stay in a match.
As for Kyrgios, I don't buy the disinterest. Usually when someone goes so out of their way to make sure everyone thinks they don't care, it is usually a defense mechanism. Giving up when you're over-matched or about to lose is rather telling of this sort of mentality.