No one's "requiring" anything. If I choose to do something something nice for a stranger, that doesn't put any obligation on you to do the same.
As for how did it happen... A Disney vacation has
always been a hot, thirsty, frustrating experience for guests. I vividly remember my son, age seven, in the middle of a Christmas party with people dancing and singing all around him, wailing at the top of his lungs, "I'm not HAPPY!"
I sincerely appreciate
every small gesture, even if it's just a smile, anyone's ever given me or my children, at Disney or outside Disney. Stickers, pins, buttons, small toys, magazines for bored children, water... Even when it was sweets that the children weren't allowed to eat, we were always still grateful for the kind thought and we made sure people knew it.
Our first trip to Disney, over a decade ago:
If some kind person had wanted to try to cheer that boy up, we would not have been offended.

Heck, they might have had more luck than we did!