i would consider myself part of the sex-positivity camp, and yeah, mocking someone for being a virgin is just as pointless as mocking someone for being a slut. sex positivity is about supporting people's choices, whether that's lots of sex or none. plus like, young people shouldn't feel pressured to be sexually active before they're ready, and i strongly think that's part of sex positivity. and lastly, mocking someone because they can't get laid/haven't gotten laid is really dehumanizing, it's saying that they're not worthwhile based on their sex life. as a sex-positive person, i think you should call that stuff out when you see it.