Like some random executive said in one of those "anonymous exec opinions" Steve Bulpett Heavy.com articles, Pritchard just seems to be wired differently. 27th overall picks that aren't obvious starters usually don't publicly demand trades. He was a four-year college guy though, and it's understandable that he wouldn't be as patient as a 3rd year guy that's only 22. Pritchard is already 25.
The other problem is the Celtics simply don't have strong leadership. The Joe thing doesn't need to be recounted here, but when you have a coach that is clearly in over his head the players are going to feel empowered to complain. This extends to the person that hired Ime and Joe, fairly or unfairly, in Stevens (who was also oddly "fired/promoted" two years ago). If you're walking around like Smart and thinking, "this guy doesn't have a clue and it ruined our season," it's going to be frustrating when you're dealt and all of a sudden the narrative is you lost a step on defense and didn't defer to the Jays enough on offense.
That's the other part of the problem. Because our best two (or three if you count White) players don't seem to want the leadership role, the team has had to empower guys like Horford, Smart, and Brogdon. Then when the team doesn't do well, of course they are in trade rumors because those are the contracts that are available to deal. It would be one thing if the stars played exceptionally and the role players just failed to support them, but that wasn't the case. The stars were inconsistent and it affected everybody's roles going down the roster. All of a sudden Smart is taking shots because Brown and Tatum for whatever reason are having one of their non-aggressive nights.
Brogdon's probably thinking, "why do I get blamed when I played hurt and it wasn't even a leg injury?" Sure, his loss hurt but he was the sixth man. It's not like we lost a starter and a rotation guy in Oladipo and Herro.