There are certain things you can do in your relationship-life that will lower the respect (candidate) friends may have for you. And that she handles different opinions on relationships badly.

What you learned about this person is that she will tell you right away what she thinks and that she has less respect for you now now that she knows you are more casual about sex than she is.

That's my opinion based on certain assumptions. It seems unlikely to me that she thinks your sex life is nothing out of the ordinary, but that it would be a good idea to shame you for it regardless. She can be honestly bothered about what she learned and she used an insult to describe your behavior.