I'd have a hard time rooting for them to beat Barcelona. I will be loudly supporting them in the semis, and would enthusiastically root for them against Chelsea.
If it comes down to the last day of the season for the league, we're playing Spurs. Plus United are evil. I would hope you would root for Liverpool at that point anyway.
Big Sam being aggrieved is just about the most ridiculous thing ever. Making up disrespect out of nothing. Then Fergie piles on. I don't get it, really.