When you say something important, and all you get back is that fluoride stare.
The “Fluoride stare” is a new and increasingly popular term among conspiracy theorists for the look that normal people give them when they have said something bafflingly stupid. It is named after supposed poisoning that conspiracy theorists think normal people get from the everyone’s favorite scary industrial wet scrubber byproduct, fluoride, in tap water.
The argument is essentially that, rather than the conspiracy nut being wrong, absolutely everyone else has been poisoned because to them, fluoride has been proven to be a neurotoxin by a single Harvard Chinese study that compared normal fluoride intake to higher-than-recommended fluoride intake and showed the world that, yes, consuming things higher than recommended levels is bad for you.
How bad it is, is the point of the study, not showing that properly fluoridated water can poison you.
Conspiracy theorists miss that point. The people that point out the issues of citing that study are brain-damaged, and the mountains of PubMed systematic reviews that show artificial fluoridation’s safety are just made by other brain-damaged people.
What fluoride conspiracy theorists actually see is likely a cross between their target’s faith in humanity being partially broken and the thought “Oh dear lord not another crazy” before trying to escape.