Most people seem to believe virgin shaming is a thing only between adolescent or young adults and people just grow up out of this and in adulthood

I don't agree with that: there might be other factors which explain that.

* there is lower percentage of v-s among older people
* those who remain virgins learn not to disclose their status and other people tend to assume they're not
* it just transforms into low-experience-shaming

Another way to dismiss problem is stating, that people complaining about that only project their insecurity, but let's ask: who does experience v-s, no matter how serious it is? Of course, insecure virgins are the target, so the problem is serious *FOR THEM*.