To the uninformed observer, it was a compassionate message of warmth and support for an old friend at a dreadful time of loss.The post from actress Sarah Jessica Parker on social media read: 'Dearest Kim, my love and condolences to you and yours and Godspeed to your beloved brother.Xx' She was responding to the announcement by Kim Cattrall, her former Sex And The City co-star, that Kim's brother, Chris, 55, had been found dead on his farm in Canada.What it unleashed in return has shocked much of Hollywood and millions of Sex And The City fans worldwide.Kim responded with a furious attack that seemed, if not irrational, then certainly out of proportion.Writing on Instagram, she said: 'My Mom asked me today 'When will that @sarahjessicaparker, that hypocrite, leave you alone?' 'Your continuous reaching out is a painful reminder of how cruel you really were then and now.'Let me make this VERY clear (if I haven't already).You are not my family.'You are not my friend.So I'm writing to tell you one last time to stop exploiting our tragedy in order to restore your 'nice girl' persona.' She linked her post to a 2017 newspaper story headlined: 'Inside the mean-girls culture that destroyed Sex And The City.' The language was such that one has to wonder if, even allowing for her obvious grief, Kim, 61, had rather taken leave of her senses.Clearly she felt blind fury that Sarah Jessica, 52 — known to all as SJP — was, in her view, yet again fostering her public image as a 'nice girl' offering support to her 'friend Kim' — and that muscling in on the Cattrall family's grief was a step too far.No one who has followed the relationship between the women was under the illusion it was very good — they are both known to have diva-ish tendencies and have been feuding on and off for years.But until this weekend the depth of hostility involved, on Cattrall's part at least, was unknown.It would seem the huge resentment she appears to feel towards SJP — over her status on the show, her salary and her influence — boiled over in that one, vitriolic rant.So is SJP entirely innocent or does Kim have grounds for her anger? Certainly there were times when the 'mean girls' atmosphere on Sex And The City reached such a pitch that neither Queen Bee SJP nor the other two stars, Cynthia Nixon and Kristin Davis, would speak to Kim.Not a word — beyond what the scripts demanded — despite 15-hour days filming together, for months on end.The three women would eat lunch apart from Kim, too, according to sources on set.When they were shooting out of town, they would stay in different hotels.There was no girly exchange of gossip while they were all having their make-up done.The reasons were many; over the years arguments raged over everything from status and money to the amount of nudity in love scenes.SJP got to keep her bra on, which rankled with Kim who, as sexually voracious Samantha Jones, was required to bare all at every opportunity.But essentially, it all boiled down to which a