The part you quoted was someone, in an email, writing about what they'd like in a man and how that had lined up with their experience of the local dating scene at the moment. Of course that's going to come across as her wanting something,
she does. Whether she was claiming that everything was great or everything was terrible that would remain inherent to the nature of the piece: we've all got our preferences.
I'm sure a lot of men don't want massively fat women for example, and if that's honestly how they feel that's fine. No-one's got the right to tell you who you ought to be attracted to.
Was she lonely? Yeah, probably. Was she alienated? To a degree, yeah - from the dating scene she'd like to be part of. Was she dissatisfied? Yes. And all those things are normal and okay when your preferences aren't met.
Is she entitled? Yes, to an extent. Pretty much everyone is. We let someone through in traffic and we consider it rude if they don't wave back, we hold the door open for someone we expect them to thank us. When you grow up with a culture you come to expect a certain action reaction transaction - what you might call grace or good manners. But it doesn't seem to me that she was being abnormally entitled based on the fact she thought it odd for someone to ask that she read Neuromancer before they'd go on a date with her.