Because they are wet from a puddle their whole life? No. Just a few hours, and its not like they would die either. It's not barren wasteland.
They can fix the damage (what little there was). Being blind, or having down syndrome a person cannot change or fix. It is part of their everyday life thus nothing to laugh at.
Plus I don't like to see people get injured so I don't really laugh at any misfortune, but there are a few exceptions if people aren't hurt, dead, or they could change the situation but chose not to.