I hear you. These three are more vocal now because they know that their time at United was/is up and they try to big up themselves in their search for new employers. I also understand why our fanbase will be more lenient towards Martial, Pogba and several others. But when a club is a mess like the one we're in at the moment, this is a very thin line to tread by the fans.
For example, the whole Pogba vs Mourinho debacle started with Pogba's role on the pitch and was blown out of proportions when it went viral on social media. It became a problem for the club which chose to do nothing. The fanbase was wholeheartedly on Pogba's side (tired from Mourinho's antics and his bad football, that much is true) and tolerated the schism because it would see Mourinho fired in the end. When Pogba liked a post which claimed that he, among others, sacked Mourinho, the fans saw nothing wrong with it. And here we are, a year later, with Pogba in the same tactical role on the pitch and with the team struggling to find its footing. Who guarantees that Pogba won't do the same and push Ole out?
I honestly don't know how we should react. What i can tell you is that the relationship between the fans and the players creates an aura around the club which can be very powerful. There's this feeling around OT that as long as you're young & promising, you will get as many chances as you want. I'm not suggesting that we should become like the RM fans who demand heads to roll whenever their team has a bad month but i do feel that we're moving towards the polar opposite of that. We can be happy with Martial & Shaw while at the same time pointing out when their behaviour isn't appropriate whenever they cross the line. Not the racist bullshite and the emotional reactions after a bad game. We don't need any attention caused by Martial's shirt number: If the manager decided to give #9 to a superstar, suck it up, score 20 goals and take it back. We don't need any attention caused by Shaw's family members: You were mistreated Luke but get your act together and stop hiding behind your sister. We don't need any attention caused by Pogba's self-importance: Think if you can lead the team to CL qualification Paul the next time your stir dust about the manager. We don't do that, we're giving them too much space to breathe because we're willing to accept the manager as the main vilain. Is there any correlation between this lenience and the very little progress most of them have shown? Don't know but i can't swear that there isn't either.