Might have been because of this:

Trae Young stood at the free-throw line and chewed on his mouthpiece as loud chants of “overrated” rained down at TD Garden on Wednesday night.

The two-time All-Star guard had another rough shooting night during Atlanta’s 119-106 loss to Boston. He went 9-22 from the field, including 2-8 from 3-pt. range, with five turnovers.

Young was also voted the NBA’s “most overrated” player in an anonymous player poll conducted by The Athletic.

https://www.boston.com/sports/boston-celtics/2023/04/18/trae-young-was-voted-most-overrated-player-in-the-nba-by-his-peers-then-celtics-fans-let-him-hear-it/?p1=hp_featurestack

Might have been because of this:

Quote

Trae Young stood at the free-throw line and chewed on his mouthpiece as loud chants of “overrated” rained down at TD Garden on Wednesday night.

The two-time All-Star guard had another rough shooting night during Atlanta’s 119-106 loss to Boston. He went 9-22 from the field, including 2-8 from 3-pt. range, with five turnovers.

Young was also voted the NBA’s “most overrated” player in an anonymous player poll conducted by The Athletic.

https://www.boston.com/sports/boston-celtics/2023/04/18/trae-young-was-voted-most-overrated-player-in-the-nba-by-his-peers-then-celtics-fans-let-him-hear-it/?p1=hp_featurestack

I know that poll was in my head as I was chanting it.  I thought it was a great taunt.

Trae is such a disaster defensively. He is probably the worst defender in the league out of players that play big minutes. And then on offense he is only effective when he is monopolizing the ball.

Those polarizing characteristics to his game. Stuff that turns off a lot of fans.

I feel the over-rated stuff ratched up after the team took a step back after that playoff run a few years. The reason for that drop-off is not down to Trae Young but down to management's bad job on roster construction. It is unfair that Trae gets blamed for that. But this if often the case for franchise players.

I don't have strong feelings for Lil Trae personally, but it could be the fact that he developed that annoying move where he would run around a screen and then stop and milk a foul from his defender. He's so little that when they run into him he really got bowled over.

Super talented one-way player. So many here loved IT and wanted him back. Trae essentially has had a career of IT’s best year.  Trae doesn’t rate himself - the “overrated” chant is really an insult to media and fans who think he’s a bit more of an impact player than perhaps he is.  Maybe Trae also overrates himself — but my guess is he’s in the company of just about every NBA player in that.

Watch out - clearly another jinx thread.

I think what’s hard to watch with Trae (at least for me) isn’t so much that he’s over powered on the defensive end because of his size, but more so his complete lack of effort on that end. He just absolutely dies on screens and doesn’t even try to navigate them. There was also a play last night where Smart was going to work on him in the post and Trae wanted no part of being there. Didn’t accept the challenge, didn’t try to embrace any sort of contact, just kind of stood there and let Smart walk him right to the front of the rim. I remember with IT he was always a defensive liability, but I’m not sure anyone questioned his effort (at least in the playoffs). If I had to play with someone who gave that little effort on defense it would p--- me off.

The Athletic did an anonymous survey of 108 NBA players.  For the most underrated player questions only 54 players responded.  Young led with 14.8% (8 votes). 

Jrue Holiday did well.  For the "Who's the best defender" question, he received 28.7% of the 98 votes.  Dort was 2nd with 11.4%.  For the "Who's the most underrated player" question, Holiday received 17.5% of the 97 votes.  SGA was 2nd with 11.3%.

https://theathletic.com/4421645/2023/04/18/nba-players-poll/

Trae is fiery and a great offensive talent. Quick, can get to the rim and finish with a floater or set up teammates for a dunk,  can shoot quick with range. But... he doesn't make his team better. Lack of defensive effort and ability and no off ball movement. If the ball isn't in his hands he adds nothing, you can't win consistently with that as your best player. His on/off splits for this series are pretty telling. His team is better when he sits.

He's the NBA version of the kind of guy I always hated playing with. Best (or one of the best) player on the floor but a boor to play with, doesn't engage in the team game, mostly just gets his.

Want to add....I think Ja Morant is sort of in this same vein.