Help! My Friend Keeps Bringing a Poor Person to Our Nights Out. Ugh.
Briefly

"I certainly hope your dislike for Mary is rooted in something other than 'she can't afford to spend as much money on appetizers as I can,' because the only sin she appears to have committed is being less rich than the rest of your friends."
"While you're certainly within your rights not to invite Mary to an event you're hosting, sending dinner-party invitations with further instructions about who someone can invite as a plus one should be reserved for more extreme cases than this one."
Read at Slate Magazine
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