Losing embarrassingly against a weak team will certainly make the mentality of the Manchester United team very depressed, especially with the many insults from the fans which will make it difficult for them to recover, so I will not expect anything more from Manchester United this season, I am sure they will not be able to start the process of being better even a little compared to last season.
When you talk about the team being depressed I'd say the other players do enter the pitch each time they have any game with depression, confusion and also they do think of how to handle the game themselves and the fans too, and wish they get something positive. Is the new guys I feel for in the sense that they will be the ones to be depressed and their mentality will drop because they're not used to this kind of messed up show they allowed themselves to give out to the fans, imagine I saw a post saying that the fans of Grimsby or the players saying that they wish to be playing UTD every week, is laughable honestly like Manchester United are not in any way strong enough to take down a smaller division side in the domestic competition. Now 1 competition down 2 to go, I won't really count the EPL because it has to do with them playing till the end of the season lets say they only have the FA Cup in their hand, let us see how they'll be eliminated in that competition maybe in a more humiliating fashion, what a disappointment to UTD.