My mindset is sexist in a way that I put females above males in a social heiarchy.
But I won't lie, I do make sexist statements often around and to my friends. Never to be an asshole, and they know that, and they just make a sarcastic comment back.
Criticize my ways all you wish, but you'll be taking more insult out of it than anyone of my friends, either boy or girl, has.
But assholes like the one Sajainta encountered, well, he was an asshole, and his statement was inherently both cruel and sexist, and intended to harm. I wouldn't consider myself anything like that.
Slut is definitley extremely offensive, from the standpoint of my social group. Its worse than saying bitch, or atleast in the context we use it, because people here call eachother that alot (aimed at both male and female, usually only when someone's getting F***ed up in starcraft, though)
However the two can be used interchangably and just as wrongly in Sajainta's case.