studies have suggested that fluoride is a human developmental neurotoxicant
Literally the first part which you bolded says quite plainly that there are, in fact, studies which suggest that it is. I’m not here to debate whether or not it actually is, but rather to attempt to show people that they should take a second look before dismissing concerns as entirely baseless, as though they have all of the answers. This is about the difference between treating science as a religion, compared to actually being capable of reading and understanding that there is no hard consensus on many issues.
“Funny” has a much broader connotation than what you’re suggesting. In this case it’s funny because the truth doesn’t align with what is expressed by his critics.