Well Gilbert Arenas and Nick Young pulled guns out!!! So throwing a ball at his teammates seems pretty calm. I assure you that there have been worse things done and said about teammates in the NBA. DW was clearly frustrated with all the changes and the way the team was being run. He shouldn't have throw the ball at his teammate but there is ZERO evidence that Gordon was a chosen target. He could have throw the ball at any teammate because it was more about being frustrated than being mad at Gordon. Gordon just happened to make the same mistake and an immature DW took his frustration out on the player who happen to piss him off. I don't see any malice nor have I read anywhere that DW disliked Gordon.
I think Zach Randolph was accused of chucking balls at his teammates during practice. Of course it isn't seen to much but you don't see coaches hit/bump refs too often but Sloan did it a couple of times. Guys lose their tempers because they are competitive so again I don't think DW or SLoan targeted their "victim" because of a personal dislike but the incident developed more out of frustration.
Again, people are always looking for the worse in people. Many people like to create drama where there is no drama. I believe that if DW hated either Gordon or AK (many accuse him of this), he would just come out and say it. DW has never been quilty of mincing his words so until I hear that DW says he can't stand Gordon or AK than I will just believe it was a poor behavior resulting from frustration and not a targeted assault on Gordon.