It's an interesting code of ethics Sir Alex Ferguson lives by when it comes to footballers.
Kung-fu kick a fan? That's fine. Sleep with your brother's wife? No problem. Bed an OAP prostitute? Splendid. Admit to deliberately trying to break an opponent's leg? Boys will be boys. Refuse to shake hands with an opponent? Ban for life.
Everyone will have a view on Luis Suarez's conduct on Saturday but far more unpalatable was the fact that Fergie was allowed to poke his purple nose into another club's business without censure.
Bookies Boylesports are betting on whether the outdated Premier League pre-match handshake tradition will be scrapped by next season and at 12-1 I'd say that's a very good bet.
More interesting, though, is the betting, next time the two North West giants meet, on whether Liverpool boss Kenny Dalglish will shake hands with his Scottish nemesis.
Dalglish will be fuming that he's been forced into a humiliating climbdown by a PR drive at Anfield while Fergie has been allowed to escape scot-free for his incendiary comments.
Fergie should tread warily on the race row. Last time he got involved in a race row, Rock Of Gibraltar cost him a fortune.
BetVictor offer 16-1 for the two Scots not to shake when United next face Liverpool. Not a good bet -Dalglish will shake with rage.
Suarez's dignified response to scoring and his equally dignified response to Patrice Evra's dangerously provocative gloating should have spared him the vitriol heaped on him because of a) his decision not to shake the Frenchman's hand, and b) his decision to be Uruguayan.
Wayne Bridge was a hero when he snubbed John Terry's handshake; Samir Nasri drew no criticism for a similar snub to William Gallas. But Suarez has been deemed the villain in a media pantomime so even if he'd sponsored a Mother Teresa fun run around the Old Trafford pitch on Saturday you suspect he'd have been castigated for cruelty to pensioners. Wayne Rooney would merely have asked for her number