Right, totally forgot that Pogba is just one of the many stellar CM players your team has under contract. That certainly requires him and his locker to be moved to the reserves, and exlcude him from the regular training sessions.
Look, it's not that hard to stick with the most likely explanation why JM made this decision without having seen him on the pitch once:
You have 3 players who -combined- swallow up close to 1m pound/week, so there's a need to lighten your salary bill otherwise. To make that happen, it's decided to make it as embarassing as possible for the next highest earner.
It's the decision your club is allowed to make, albeit a classless one. It's not a usual thing, JH as a recent example, where a lot of you guys where trying to immediately draw a connection to Bastian, calling out supposed hypocrites, didn't get his locker moved and kicked out before day 1 either.
No need for victim blaming here at all.
I follow a number of leagues so I am no stranger of clubs pushing players out because of their high salaries. Juventus being one of the best in this fine art. Baggio, Vialli even Del Piero was kicked out of the club the day Juventus thought they could easily live without them. They are the most ruthless club I've ever seen.
Having said that Manchester United are not Juventus. First of all we're the richest club in the world. We are a monstrous money making machine which generate loads of profit every year. A club that had spend 157m in 1 summer transfer window despite being out of the CL can certainly afford to keep Bastian if they want to. Also unlike other clubs we tend to take care of our players. The club have kept Robson till age 36 (a rare thing in the 90s) even though he barely ever played and throughout the years there were many players who have overstayed (ex Fletcher, Gaz, Keane, Giggs and Bastian's own former teammate Hargreaves)
You may say that we're now managed by the evil incarnate as opposed to SAF. Which I would counter using 2 arguments. First of all SAF was more ruthless than Mou was when he first joined us. He showed the door to alot of players, some of whom had given more to the club than Bastian ever did. Secondly Mourinho had gone to a great extent to try and accommodate most of the players already in place. Carrick whose legs are gone was given another contract, Fellaini a panic buy who represent the biggest feck up of Moyes administration has been kept and protected from both media and fans, while the likes of Darmian and Depay (who where horrible last season) were kept. Mou seem to have found a role even for LVG's other love child Daley Blind and Mou's 'arch nemesis' Juan Mata (who must be one of the top earners and whom Mourinho kicked out at Chelsea)
So what went wrong with Bastian? God only knows. What's sure is that Bastian was one of our worst performers last season. He also vanished in a crucial part of our season only to return fresh and fit for the EURO. Maybe that 'coincidence' is what convinced Mou to push the red button on his United's career? As said before United tend to be quite accommodating with old or injured players. However they seem to be quite vulnerable at those who do not seem to pull's one weight to their cause or start acting a bit funny. Just ask RVN, Ince or Beckham, all players who were shipped out despite still being in their prime.
Anyway we're entitled to send Bastian to the reserves just as Bastian is entitled to cash in on his cheque despite doing nothing. If one of the parties disagree with that, then he only have to meet the other party and work a way out by rescinding the contract. Bayern keep bitching about how we have treated him. However they have yet to offer Bastian a way out by bidding for him. Surely such classy club wont allow one of their legends to be treated that way can they?
Which leads us to your last point ie class. Oh that's pretty open to interpretation isn't it? For example you seem to think that a club that sends a player to the reserves despite the player in question had done feck all for that club is classless. I think that a club who doesn't fire a manager who showed his private parts to the players and who keeps somebody who refused to collaborate on the biggest corruption scandal in football history as their honorary president as a shifty club whose devoid from any sort of morals whatsoever. As said its all open to interpretation