He had issues in his personal life last season but this season from what we
know and aren't
assuming, yeah. Start of season he was being rotated in and out of lineup, mostly being sub despite his performances off the bench and did well. Even after Sanchez came in and Martial was moved to the right, did he complain once about it publicly? No. You've said he is not a committed professional based on:
- an assumption from you that because he's missed games via injury, that the injuries were faked by him and that the fake injuries were done around the time he rejected a new contract despite the timeline clearly showing that he rejected a contract a month after he was actually injured.
- a lie from nemanja15 about him unfollowing United players on Instagram, which you called Martial a 'twat' who does 'childish nonsense' instead of actually looking and seeing if it was true first.
His performances have deteriorated - along with most of our players - as the season went on but he has still been trying in those games, like against Chelsea, despite his passes and stuff mostly going wrong except for that corner for Pogba.
There has been no girlfriend/ex drama, and his agent hasn't been mouthing off in the media this season. Compared to last season it is night and day. Just because he doesn't smile and hasn't signed a new contract doesn't mean he hasn't been acting professionally. Willian with the interviews slagging off Conte and the Instagram post blanking out Conte is an example of someone who isn't being professional.
If Mourinho wasn't happy with Martial's behaviour at the club, he'd have berated him publicly about it. Instead, he even said good words about him several times this season.