I didn't say I agree with that mode of thought (or lack of thought), only that I'm not surprised by it. Nonetheless, there are plenty of vacation destinations that are, indeed, turn-your-brain-off vacations, and the resorts or cruise lines package their services as such - "look, just show up at this location at this time and we'll take care of the rest." They hire someone to set up the itinerary (what there is of one), that agent books the travel, perhaps even arranges the travel TO the travel (the town car to the airport for example), they itemize every detail to make it as simple as possible. People just throw in a bag what they think they'll need, go outside when they hear a honk, get out of the car when they're told get out, go to the gate that's on the paper, board the plane when they're told to board, eat and drink when presented with food and beverage, get off the plane when they arrive at the airport closest to their destination, a motor coach or cab is waiting to take them to the resort, someone takes their bags, gives them a key, tells them where to go when it's food-in-the-piehole time or kill-brain-cells-with-delicious-booze time. Whatever they might have access to - day tours or casinos or boating or parasailing or shuffleboard or basket-weaving classes, they can choose to do nothing but sit in a chair and watch the sun move across the sky. Someone might show up with a snack or a drink, otherwise they only move when hungry or in need of precious booze. And they can do that every day, feel like they've really "experienced" the culture of a foreign land, and go back home when the motor coach pulls up to the hotel to take them back to the airport.
And if those are the vacations you've always taken, the idea that you might have to think, plan, make choices, it's like trying to remember the final exam from your 2nd year Spanish class: "I have to whaaaaaa now?"
Again, I've got no problem making the plans for myself, but I don't roll my eyes thinking "schmucks" when someone doesn't know the ins and out of 180 day dining reservations or things they don't have to do at any other vacation. I differentiate between "don't know" and "don't wanna know" and reserve my scorn and ridicule for the latter.