I think the fans are booing him at least partially for how the 76ers are using him. The numbers on him, Simmons and Embid together are all awful (while just about any other lineup with two of those guys is good and some art great). From what I have seen on liberty ballers basically 95% of the fans there want him to come off the bench and spell Embid 5-6 minutes in. However, I think the team has refused to do it so far because of optics. There really are not many 28 million a year bench players (i am wondering who is the highest one in the league right now, most similar could be Milsap but he is an expiring). It does make the contract look worse (and al's counting stats will probably decrease further) if they cut him down to about 25-27 minutes which is what he should be playing and probably what he would be playing here based on his trajectory. One of the stupidest things about the 76ers the last few years is their concern with optics. It probably started with the thin skinned colangelo and his burner account, but things like the insistance on getting a fake first round pick for nerlen's noel etc, they just seem like a team that is terrified of negative press. There are certainly contenders for other "worst contracts in the league" but some of them, like Chris Paul, look way better than they did 6 months ago. Harris ironically is also another contender, but he is significantly younger and ironically, would look a lot better with Horford off the court.