IF Barca is doing that to Munir that is terrible form and I would expect better from the club. So far that is just rumors, I don't think they would be this petty.
Rabiot is 23 and a pampered professional athlete, the coaches and leadership for France Football and the QSG should be mature, grown, men and rise above petty adolescent/young men behavior. I know where I would lay more blame, or where I might expect personal growth.
Personally I see zero reason to be on good terms with QSG. They never sold Barca the players they wanted--Silva, Marquihos, Verratti--even for reported good offers, and then buy out Neymar where he/club did it relatively late in the summer window. They are enemies and no reason to not keep it that way.
IMO QSG is getting back how they treat other clubs and their own players. Barca has actually has made efforts to accomodate their own players wanting something different (Pedro, Thiago, Villa, Cesc, Mascherano, etc), even some cases where it hurt the squad quality at the time. I am not aware of Barca officials trashing a player like QSG has to the media with Rabiot nor freezing out a player who otherwise could contribute on the pitch. Usually is is "OK, good luck to you" (with a hint of well you may not find the grass is greener but that is you choice) and sometimes in fact a celebration send off.
https://twitter.com/jplusun/status/1036368788000792576
This is why Rabiot isnt liked and is phased out of the team.
He repeatedly made the club and supporters believe he was a true parisian and wanted to continue with the club.
He was also the face of our academy in the team.
There is also the relationship he had with Nasser.
IMO, in this case, PSG were idiot not to draw a line before last summer to renew or to be on transfer list.
However, it is easy to understand why we wouldn't make him play anymore.
First of all there is the breach of trust. I wouldn't trust Rabiot putting in the efforts when he knows he isnt going to stay anymore.
Secondly, well, he knows the club is in tight waters with FFP. He could have helped the club to get even pocket money. When we came for Kehrer, his contract was short but he said that, if we dont do a correct offer to Schalke, he wouldnt sign. We paid him 37 M.
Rabiot has everyright to do that : it is good for his bank account and he gets to play in a glorious club. However, it has a sour taste when it is an academy player.
Look how many players PSG has sold those last years. PSG isn't a prison. Like any other team, you have some players that are not on transfer list and the club wont be happy if you try and force for them.
Do you think that Barcelona would easily let any club flirt and buy his most precious players ? Even for "good offers" ? Barça is selling Digne, Denis Suarez, Paco Alcacer etc.
Put in a good offer for the likes of Meunier, Choupo-Moting, Nkunku and you'll see if PSG is a prison. They would be sold like Berchiche was, Guedes was, Lo Celso was.