Those young men need to stop basing their self image on their own ego and sense of sexual entitlement.
What we're seeing here, in my humble and uneducated opinion, is the end of a period in societal history where women served the role of sexual currency in a market of male status. The social and religious pressures on women to validate men through sex and marriage are no longer relevant, and women are now seeking sexual fulfillment and relationships on their own terms, rather than those dictated to them by patriarchal society.
However, many men are still wedded, as it were, to the old model whereby their social status is accounted for by the number of women they have had sex with, and whether or not they are in a sexual relationship at the moment. They feel cheated because society has told them they are entitled to sex, and that there is something wrong with them if they don't get as much of it as they want.
What bothers me about this conversation is that disastrous, society-shattering consequences are always mentioned if women keep choosing not to have sex with more men, but no one seems willing to suggest that men need to change the way they view sex, relationships and themselves.