Why do women think a man's virginity is a prejudice?

Women and men, I've often heard this insult directed at men, and I see that women hate this double standard: men have no social limitations on intimacy, while women do. However, just as often, this virginity results in mockery and a loss of value for a man. Clearly, the two situations are contradictory, and both spread a hatred that seems inconsistent. One excuse that can be used is "Well, he deserved it, that doesn't mean I feel this prejudice," as if it were a generalized insult, which you don't want to generalize. Sorry, but as you can see, if you think that skin color is involved instead of virginity, you recognize that it's not valid in my opinion. So I'd like to know your thoughts on this topic!