How we as fans see United and Chelsea isn't really the issue here though is it?
As for misunderstanding the psychology - I wouldn't think so: if manager and players see defeat in this game as some kind of hammer blow to morale, or victory as an indication that we've got Chelsea's number, then I'd be concerned as to the strength of the mentality of all concerned.
I'm really looking forward to this, as a final bit of pre-season fun before proper, serious football commences.
I'll be dead happy if we win, fuming and annoyed if we lose.
Nothing too profound though.