Is it dignified and the right way to play to start scything people down just because you're losing, as Ronaldo and Paul Scholes were doing in the last 10 minutes?
And, as has been mentioned, the fact that Fergie didn't whine like a childish little twat afterwards shouldn't really be that noteworthy; the fact that it is speaks volumes about his usual levels of gamesmanship.
Paul Scholes always tackles like that. No malice, just dreadful at tackling, always has been.