I've been critical of Pogba this season and I think he needs focus on the pitch but that has nothing to do with his hairstyle and what he does on social media. It would be stupid for club/fans to demand Pogba to stop those social media updates. He can be whatever he wants and do whatever he needs to do as it is his life. Having said that, I felt that his last update on Instagram (say what pose cupping his ears in response to Guardiola's ill-advised comments were not the brightest idea. Sometimes it is better to have your say on the pitch and then do the pointing but it has nothing to do with hairstyles and dabbing.
But it can't be denied that he has been underwhelming this season. He plays like an angel but goes missing in many important games. Whether it is because of Pogba himself or because of the tactics we are using, I don't know for certain, so I won't get into this too much in this thread. Generally, extroverted players are criticised more in the press when they have poor matches, sort of 'You talk the talk, now you walk the walk'. I don't know if Gary Neville was saying these from a sympathetic perspective that Pogba exposes himself to criticism more than other players. Ronaldo, for instance, seemed to come alive with criticism. The more you booed him, the better he played. I don't know how criticism affects Pogba. If it does affect him, perhaps a more savvy/less flashy approach may endear him to the press. Although that's not needed, it is once again entirely up to Pogba. Listening to Souness today, I think there's more than a hint of casual racism about the criticism of Pogba, but that's my view anyway.
Personally, I've been disappointed solely by his contribution and I hope he performs much better next season. Disappointment is equally towards Pogba for his complete meltdowns in a few matches and Mourinho for not getting enough out of him.
tl;dr : Can't make my mind up.