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