I keep having to use this one with the same person - my mother. In the past two weeks she has:
1. Insisted that my graduation ceremony's time "doesn't work" for her. She's mad that everyone's lining up at a certain time to sit together and she doesn't want to wake up that early, so she wants everyone including me to wait an hour to go in. It's free-for-all seating, and I have to be passed and tweaked and lined up during that time to boot - but she insists I come out and wait for her instead. I said "The line-up time is at 8. Everyone will be going in at that time and I will be going off to lineup. If you can make it, great, if you cannot, hopefully you can still find a seat." I've repeated it word-for-word twice.
2. Now I'm throwing a party in honor of two cousins who are coming in from out of town next week. Everyone I know adores these people and my cousins wanted to see everyone again. Within two seconds of getting the invite: "This will have to be changed because I might not be able to come, I might be doing (x) with your cousins." THE PARTY IS FOR THEM. That's in the invite. They'd already positively RSVPed. She's not doing (x) with the cousins because they want to be at my house with my friends, she doesn't even like (x), and they'll be spending every single day with her before then anyway. I replied "It will be unfortunate if you cannot make it."
My Facebook is full of these things. Every single event I do, the first reply is always about how it won't work for her, or how she doesn't enjoy some aspect of the event, or how she saw something on how this event is bad, or how I didn't think of some sort of extremely minor detail that will surely ruin the party and life and butterflies will die and it will be a long, cold, winter and we will have to resort to cannibalism because I did not mention disposable wine glasses in the invite. Seriously, once it was about stemware. Which I actually had thought of, I'd gotten a ton of matching stemware for 10 cents apiece at some used restaurant supply sale, but why would I have put "don't worry, we have enough glasses!" in an invite? It's kind of a given. "Hey, sorry you have to drink the chardonnay out of the Ninja Turtles tumbler." Though my kind of friends would have thought that was funny.