Madness string 87259

Random mermaid
There are people, and we're all probably related to at least one of them, who can 'rationalize' anything, or who have beliefs that are so stubborn that they just cannot hear reason if reason is not aligned with said belief. Sometimes it's not worth trying.
The first time you say no you should be as polite as possible. The second time you should be firm as possible. But the third time you can be as rude and mean as you like because it's pretty clear they're not listening to you anyway.