"Were you saying something of relevance? I'm sorry, please do go on with your diatribe as I attempt to enjoy my Walt Disney World trip. I mistakenly thought that being here would alter your demeanor from the way that you behave at home."
Took my MIL with us once. A whole week of listening to her complain, mainly under her breath, about everything including amounts of food that other people (not in our party) were wasting. I was a good about just ignoring until the last day at breakfast when I asked our son what park he wanted to go to for our last morning and he said the MK. MIL (notice there's no D for dear) started in about having seen everything there and why not go somewhere else. I looked at her as said, "I asked Jon, not you, where he wanted to go. It's not all about you, Ann." Told my hubby when we got home at about midnight that night that I loved him very much and he was to remind me if I ever had an idea to take his mother with us on the trip again to remind me why he was saying, no,no, no! Every once in a blue moon she will try to drop a hint about wanting to go again. I just say, well, maybe Heather or one of the other grandkids will take you with them.
Of course! Alas the lovely photo of me sitting next to one of the classic elephant trash cans getting my face painted by a clown isn't on Photobucket else I'd share! LOL!
haha I would be like: you ungrateful twit! Look around! This is a privilege! There are many people who wish they could come here, and you are lucky enough to be here, so stop being a jerk and be thankful I didn't leave you at home...now let's go on it's a small world a few times! haha
[Speaking to the nearest CM]: "Sir, SIR! This person is BOTHERING ME. He/she won't stop following me, even though I've asked them to, politely, several times. They're making me very uncomfortable! Would you please have security escort them out?"
People complain. It's a fact of life. They'd much a lot of money to have a really bad time. But because they did, and other like them, it helps keep Disney afloat. To each his own.
If they were standing next to me I would yell, "KRRRRSHHHHHH What was that?! KRRRSSSHHH I am going through KRRRSSSSHHH tunnel can't KRRRSSHHH hear you KRSSSHHHHHHH." Then walk away.