Now for all the people saying "#twofoottackle = red card" and the line "by the letter of the law it was a red" you really should know better and check "the letter of the law". In fact you can do it right HERE. Also to quote Referee Development Officer, Peter Roberts with reference to two footed tackles; "If he takes the ball cleanly, it is a free kick and a caution." I rest my case your honour.
But anyway the damage is done, now City should use this as motivation to push harder to bring the Premier League title to the Etihad Stadium. Over the last few weeks there has been a growing siege mentality surrounding the squad with all the talk of City's season collapsing and some rather dubious red card decisions and officiating that has had a say on certain results.
We saw this mentality in full force in the FA Cup against United and much has been said about the performance that day. What City need to do now is continue that same determination right up to the end of the season, starting with Liverpool's visit to the Etihad in the Carling Cup.
I know for a fact there are fans of every team that don't feel the competition is worth winning. I beg to differ, silverware is silverware and although the big prize is ultimately the Premier League trophy, the Carling Cup is important for the players and the teams taking part regardless of what the fans think.
How Mancini will go about the starting 11 is anyone's guess as although Komapny's dismissal is a massive blow there are players waiting to step up to the challenge. Micah Richards and Stefan Savic are the 2 other players that can play at centre-back alongside Joleon lescott whilst Kolo Toure is away.
Savic put in a great performance when required to against United and even picked up a nasty blood injury that was quickly wrapped up for him to battle on. To be fair to the lad, he didn't put a foot wrong and will be itching to prove his worth to the team now he has a chance for a short run in the starting 11.
There is also a question surrounding the fitness of David Silva, although the Twitter rumours of a broken ankle a just a little wide of the mark.
One plus point to take note of is that Gareth Barry has served his ban which was picked up against Liverpool in the Premier League, and will no doubt return to action straight away to bolster the options in the centre of midfield and provide cover for the roaming full-backs. Barry has been the most consistent player so far in this campaign and will hopefully pick up where he left off.
Another positive is that both Mario Balotelli and Edin Dzeko took full part in training and will hopefully be in contention for a return tomorrow or against Wigan.
On the transfer front, Kompany's ban may mean Onuoha gets another 6 months at the club as he may well be needed for cover should the unthinkable happen to any more defenders before the transfer window closes. Although Mancini showed little intent on giving him another chance as he opted to name 16 year old Karim Rekik on the bench ahead of him on Sunday.
The fans certainly have their part to play. The 2nd half of Sunday's game showed what can be done when the crowd gets behind the team. Several of the players commented on it after the match and clearly respond to the noise levels in the stadium as we have seen several times this season. The louder the crowd, the bigger the performance has been. So you know what to do.
Twitter: @MikeWalsh1880 or @mcfcDSLeftFoot
Facebook: David Silva's Left Foot