It's 85-90% malicious, and the rest is just incompetence, because Bickerstaff holds no one accountable for their actions EXCEPT Jaren.Nor does he run any plays for him.
The malice is coming from one person really: Conley. He wants to be an all-star, and he's jealous of the attention JJJ is receiving, and he goes out his way to sabotage him, whether its ignoring him when he has a mismatch, suddenly not being able to make entry passes, or just plain ball hogging.
It's gonna remain this way as long as Conley and Gasol are on the team.