President Donald Trump and Health and Human Services Secretary Robert F. Kennedy Jr. announced, to great fanfare at a press conference on Monday, that the administration is endorsing an unproven theory that Tylenol during pregnancy increases the risk of autism.

The announcement drew a great deal of anger and criticism from commenters on social media.

"Trump is announcing an unproven link between autism and Tylenol," wrote radio host Barry Markson. "Literally just called Tylenol bad. Spreading conspiracy theories now about vaccines and autism that have been disproven for decades. Unbelievable. Trump won’t take chemicals out of food but he pushes conspiracy theories about autism and vaccines. Trump is now giving his opinion on other vaccines that have no medical or scientific support. Unbelievable."

"Trump claims Cuba 'has virtually no autism' because they 'don’t have Tylenol,'" wrote the progressive account Call to Activism. "Reality: Dictatorships don’t have good health data. Autism exists everywhere — authoritarian regimes just don’t track it. F--- Donald Trump and his lies."

"Trump's deranged, pro-death takes on medicine and autism are giving me a headache and forcing me to take a Tylenol," wrote former CNN contributor Wajahat Ali.

"Depriving women of the only pain reliever that's considered safe in pregnancy on the basis of an extremely dubious autism link is not going to help meet any of the Trump administration's pro-natalist goals," pointed out analyst Matt Yglesias.

"So we learned today from medical experts Trump and RFK Jr that people in CA are more likely to get autism and Amish people are immune but I’m not sure what happens if an Amish person goes to CA," wrote former GOP strategist turned progressive Meidas Touch editor-in-chief Ron Filipkowski.