You guys are awesome with feedback and support. I deeply appreciate all of you taking time out to respond to my post.

I've been thinking a lot about the situation and if I even want a explanation from her. I've come to the conclusion that I do want to know why she would react the way she did and why she would use that word. Over the years, I have discovered that when people use terms like "slut" "*****" or any of those lovely adjective, it reflects on their insecurity about themselves. Typically they've had to deal with something that has lowered their self-esteem and they project their feelings concerning themselves onto other people. Before having lunch with her, I think it would be best to sit down and have a talk. I'd like to ask her if something has happened that has caused her to feel she needs to degrade others concerning their sex lives. Whatever the case is, I hope we can talk it out. Losing a friendship is emotionally taxing.