I get their point that you can't provide a "No" in the reminder. But there should be an option (maybe even hidden under "advanced settings - here be dragons!") for this.
Problem is (and that was their argument) people press this button all the time without reading the dialogue at all, and then won't know how to turn it back on. A messenger app has to deal with very technical illiterate people. But there should be an option in settings for the tech savvy user.