Awful human being alert

It's hard to believe that someone could be as lacking in self awareness as the woman who wrote this letter to advice columnist Dear Prudence. 

How could anyone read this letter and not think they are coming across as an classist, elitist, repulsive snob?

Dear Prudence,

Recently my friend Amy made a new friend, Mary. I’ve met her a few times, and while we were polite to each other, she isn’t someone I’d care to interact with more than necessary. I don’t seek her out, nor do I invite her to social events. Mary has slowly become part of my circle of friends. She has made a few comments intimating she’s upset that she hasn’t been invited to some of our get-togethers, but she is in a very different financial bracket than the rest of us. The restaurants and events we choose to go to are pricey. I recently hosted a dinner party for my friends and their plus ones, and Amy brought Mary. I didn’t want her at my house. We’re not friends, and I don’t enjoy her presence. I’m hosting another dinner party for the holidays, and I know Amy will bring Mary. I do not invite people I don’t want to be around to my parties. How do I politely tell Amy to stop bringing Mary?

—She’s Not Invited; She Comes Anyway

You can read Prudence's response to the letter here.