I think that upon overview of what entitlement is, if searched on google, it really does describe the origin of where a lot of male frustration comes from.

Language and common discourse, especially on this sub and other forums like it, exhibits a few common themes.

Men have been "lied to" - they believe they should have a partner just for being who they are and that they are somehow a main character in one of their favourite films from childhood who gets the girl

That women should settle for their equals. "Equals" that these men determine for them.

That they simply know what's better for an entire gender than that gender knows themselves, and that there's a sort of audacity to go against this.

That male loneliness, or at least their specific loneliness and lack of success in dating, is literally a society ending epidemic and that it should be taken incredibly seriously by everyone

In some cases, the dismissal of female autonomy of choice and sexuality as second to a mans need for sex.

I believe a lot of men project entitlement onto women. When in fact it is they who are so entitled that they can't even comprehend how one sided their stance and sympathy is. How dare she not settle with me, her objective match, and instead give her attention to other men. She's being used by attractive men, whereas I would treat her right and am her match, she absolutely should be with me (despite not understanding that she would be incredibly unhappy settling)

The demand that women should lower their standards and that you know exactly what her standards should be and that her happiness is absolutely secondary to her simply knowing her place.

And finally the assumption that men know what would make women happy more than she does. You don't. Even if it makes no sense to you. You do not.

There is an entitlement. Men believe and are raised to believe that they are owed romantic success, and that they should have to work very little towards this. They believe that women don't know whats good for them, and that women have no right to determine their own worth. They also sometimes believe that women's sexual freedom is up for debate, and that the sky will literally fall if their own sexual frustration isn't solved - oh, and it's mostly other people's fault, not there's.