I have a problem with my girlfriends previous promiscuity in first year

No I'm annoyed at the knee jerk reactions people seem to have in threads like this. It's that simple, so drop the sarcasm.

And I'm not talking about the anti slut shaming movement as a whole so let's not diverge into that.

I don't think it is a knee jerk thing, I think people see the hypocracy in how men and women are treated with regards to casual sex, and how badly people are treated when they haven't hurt anyone. That's a reasoned, thought out opinion. I don't know if you can say the same about people saying "ew that's dirty, what a slut".