drinking the kool-aid

refers to accepting something blindly without thought or criticism.
Linked with Cults and mass poisonings.

The phrase “drinking the Kool-Aid” refers to followership at its worse. It was coined after a delusional, pseudo-guru named Jim Jones led his cult, the Peoples Temple, to mass suicide. Over 900 people, including 304 children, killed themselves by drinking from a vat of grape-flavored drink laced with cyanide.

p1: "Wanna start a cult?"
p2: "I'm not drinking the kool-aid"

or
p1: "Dinosaurs could all fly and were secretly dragons"
p2: "Wow you really drank the kool-aid huh?"

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