First, let me clarify your question: young men are frustrated with *attractive* young women. Plain Jane and below, not so much. To be fair, these women are frustrated too. And not just the young attractive ones. This segues to my point: just about everyone is frustrated -- with life.
The word "entitlement" gets thrown around a lot -- too much -- and often improperly (especially in the context of Caucasian men, on whom the Western media has seemingly declared open season on). I will endeavor to use it properly. The problem is that people in general are frustrated with life. People feel entitled to a lot of things nowadays for no other reason than simply someone gave them the impression that they should.
College students feel entitled to a job just for graduating (and feel justified in not paying back their loans when one doesn't materialize). Illegal aliens feel entitled to citizenship because they've had a hard time in life. People everywhere feel entitled to healthcare, education, and a house, because some politicians said so, and that sounded like a pretty good deal in exchange for a vote. Men feel entitled to female affection if they bend over backwards to please them and spend time and money on them, because that's what the movies, TV, his mom, and the internet said he should do. Women feel entitled to a perfect husband, soaring career, and happy family, with no sacrifices, because someone said it should be that way. Overweight people feel entitled to confidence and happiness about their life and appearance as it is because a lot of other overweight people say so on newspapers and TV shows and internet columns. Everyone feels entitled to acceptance and kindness and good feelings from the world and life because they exist.
Ordinary people feel entitled to extraordinary things because ordinary people say so.
And this, all of this, will never ever work out. Never. The closest they'll get is crafting an elaborate illusion that they have what they wanted, and then go to extreme lengths to prop that façade up. In fact, people do that already, and have been since humans existed, but it's especially prevalent recently (or at least it seems that way). There's tons of people walking around with crazy narratives about the world and their place in it running through their heads. Either that, or they're an eternal victim of the universe and are powerless to do anything about it -- so they tell themselves at least. They maintain a much smaller, but stubborn, illusion -- the illusion that they have no control.
Instead they get together with like-minded people (they aren't hard to find) and figure that if enough of them get together they can warp reality and bend it to their will, without having to make any effort personally or face something about reality that makes them uncomfortable.
Sadly, the thing that people have little to gain from telling is the truth in this case. And the truth is, you aren't entitled to much (try getting elected telling people that). You're entitled to your life and the freedom to live your life as you please free from coercion. Anything beyond that is up to you. You can try to change reality to fit your design -- a waste of time, in my opinion -- or you can accept reality and go from there. It's popularly accepted that almost all human beings fear death above all. I won't dispute that, but I think death is at least tied with reality as people's greatest fear. In a sense, they are opposites -- being and unbeing; existence and nonexistence; life -- real life -- reality, and death. Yet they are similar in this regard: people spend a great deal of time and energy running from both, but they have a way of catching up to us all in the end.
So, these young men and their frustrations, what should they do? The same as any of these frustrated people should do (but few will actually consider, and fewer still will actually follow though on). Face reality. Accept that they are not entitled to [blank], merely the freedom to pursue it (the once popular phrase "life, liberty, and the pursuit of happiness" comes to mind). They are free to live the life of their choosing, but in doing so accept responsibility for what happens. Specifically, people need to accept responsibility for their minds and the stuff they allow in them. A lot of people are lousy skeptics and accept all kinds of faulty thinking for no other reason than it appealed to them. They believed it because they wanted to believe it -- that's a surefire way to a miserable, confused life. These men (and this can be applied more broadly) need to realize that a lot of popular notions they've been taught about women are just flat out wrong. Popular notions get popular because they are appealing to many people, not necessarily because they're true. Reality bites, and the truth is often concealed and must be be sought out.
Ideally, someone older and presumably wiser about the world, say a parent, would slap some sense into these men and set them straight about the way the world really works. Sadly, the parents are often just as deluded as the rest nowadays.
This entitlement and victim mentality can never succeed. The constant cycle of failure and setback chafes and inflames their ranks, driving them to ever-greater extremes and ever increasing hostility and envy. It's going to get a lot worse before it gets better.