To be fair, there seems to be a lot of baggage that follows Pogba, suggesting he's a bit of a problem behind the scenes. I found a timeline of his time with us so far:
September 2016 – The first signs of Pogba struggling to adapt to Mourinho’s system emerges in United’s 2-1 Premier League home defeat to rivals Manchester City. TV pundit Jamie Carragher calls Pogba’s performance “ill-disciplined”, saying he was “like a kid in the schoolyard, running where he wants and doing what he wants.”
March 2017 – Following an FA Cup defeat at Chelsea where Pogba struggles again, Mourinho accuses the player’s critics of being jealous at how much he earns.
September 2017 – Reports emerge that Mourinho is unhappy that Pogba flew to Miami to recover from a hamstring injury rather than stay in Manchester.
January 2018 – Pogba is hauled off just over an hour into United’s timid 2-0 defeat to Tottenham and has a heated debate with Mourinho on the Wembley touchline.
February 2018 – Mourinho drops Pogba for the next game against Huddersfield, hauls him off again in the 1-0 defeat at Newcastle and benches him for the first leg of the Champions League clash with Sevilla.
March 2018 – More unwelcome headlines follow for United as Pogba and Mourinho are said to be “barely on speaking terms” amid reports the midfielder could be sold in the summer.
August 2018 – Mourinho suggests Pogba was unable to be distracted by external matters during the World Cup due to the short nature of the tournament. Despite returning late from the World Cup, Pogba starts and captains United in their opening match of the season – scoring in a 2-1 win against Leicester. But he says after the game that “there are things I cannot say, otherwise I will get fined”. Pogba is linked with a move to Barcelona before the end of the transfer window, but Mourinho says: “I have never been so happy with (Pogba) as I am now.”
September 2018 – Pogba is thought by some observers to be questioning Mourinho’s tactics after the 1-1 home draw against Wolves by saying United should “attack, attack, attack”. Reports emerge before the Carabao Cup tie against Derby that Mourinho told Pogba in front of the squad he will never captain United again as he does not embody what the club is about. Pogba is rested for the Derby game and Mourinho says afterwards he has taken the vice-captaincy away from the midfielder, but the manager denies the pair have fallen out.
– Mourinho and Pogba share a tense training ground exchange the day
after the captaincy news and, though Pogba started against West Ham, he is substituted 70 minutes in to a 3-1 defeat.
Let's not also forget there was the 'Caption this!' when Jose was sacked and the rumours that Pogba was overjoyed at training and being very vocal about Mourinho being sacked for fecking with him.
Latest is that Solskjær and Pogba have had a bit of a fallout too.
Hard to know what to believe at this point but he's either unfairly targeted by a lot of people making up lies or some of this attitude problem he may have is justified criticism.
*Forgot to add that apparently Raiola offered him to City, which he wouldn't have done unless Pogba wanted to go.