If it's fine to shame men for being virgins then it should be fine to shame women for being sluts.
Are you implying that it's okay for people to be shamed for their sexual activities, or lack there of?
Yes, if you can shame men, you should be able to shame women as well.
We are all allowed to make our own choices and what we do is our business, not anyone else. Would you like it if someone characterized you based on your sexual activities? You should not comment on what people do with their own bodies.