I don't think he meant to insult you; he probably assumed you'd find it hot too. Dirty talk during sex can be awkward and offensive when both partners aren't on the same mindset, as you've experienced.
rukia92 wrote...
should i feel lower now that he got off thinking i was a dirty little slut?
It's not really a matter of should but a matter of do-
do you feel lower? What's right for one person is not always right for another. You need to be frank with yourself and your boyfriend about the matter. Were you turned on or turned off? What sort of emotions did you feel afterwards? Do you see yourself allowing this again or is it completely off limits? That sort of thing.
rukia92 wrote...
and finally, is it a big turn on when you say that to a girl and they get into it?
Yes, I do find it exciting. However, in the kind of relationships I favor, it's a standard part of the sexual lexicon.