Jose is the boss. He's allowed to talk some shit about his team (not the club, the team), I'm not a fan of highlighting particular players though.
But thats the thing, I don't recall Jose ever highlighting Pogba after a bad result, only the team or he'll say something like "certain players". Only for Shaw, Jones and Smalling do I recall him highlighting them in a somewhat negative fashion.
Pogba is below Jose in the authority at the club, the manager is the boss of the players, so anyone who say "Pogba has every right to chat shit back about Jose or the club" has no clue how chain of command works. Your boss is allowed to say things about you as long as they don't cross the line, but you are obligated to stay in line and not chat shit about them or try to break authority.
If Pogba cannot accept that United is a club which is NOT run by the players in the dressing room, then he and that fatso Raiola can leave.
If Paul really wants to make it here at United, then firing his agent would go a long way towards showing commitment to United.
I hope Pogba does love the club, because if he does want to leave then its clear he doesn't. And if Jose wants to be here and Pogba doesn't, then its obvious Jose should stay and Pogba should leave.