We're not sure whether people dislike Sarah Jessica Parker singularly, or they just really don't like 'Sex and the City,' and so she's damned for it via association. One person who has a particularly strong dislike of her is her former co-star on the show, Kim Cattrall. After Parker sent her a tweet wishing her well after the tragic death of her brother, Cattrall responded by calling her a 'hypocrite,' and saying that she had been 'cruel' to her during the filming of the hit television series.
It's worth noting that nobody else who has worked with Parker has negative things to say about her, so this might just be a case of two people not getting along, and nothing more. The fact that Parker's name is attached to no less than seventeen different charities suggests that calling her 'cruel' is wide of the mark, as is the fact that she spent years supporting actor Robert Downey Jr. as he struggled with substance abuse issues.