I hate Mourinho as much as the next United fan, but I'm not really sure how 'filha da puta' (ie. daughter of a whore,) is any way more sexist than saying the more common 'filho da puta' (ie. son of a whore.) The group Women in Football are apparently claiming his use of the feminine ('filha') proves that he directed it at Carneiro, and therefore, it was a sexist attack. I have no doubt it was indeed directed at her, but what's sexist about it (unless you take issue with the expression in general, and its slandering of the mother of the 'filha/filho'?) If that's sexist language, then you'd have to charge every player playing in Portugal or Brazil, as it's a pretty common expression (not to mention anyone else muttering expressions such as 'son of a bitch' or 'hijo de puta.')
I think Mourinho's behaviour towards the medical staff was despicable, but I've never really felt it was sexist; rather, it was just an example of winning at all costs, and/or throwing someone under the bus when a result doesn't go your way.