He was referring to the Jonestown massacre in Guyana in 1978 where a crazy cult leader poisoned his followers with poisoned grape drink.
Except it was Flavor Aid not Kool-Aid but somehow the latter brand has crept into the lexicon.
'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.'
https://www.forbes.com/sites/bruceweinstein/2018/03/29/two-great-reasons-to-stop-saying-i-drank-the-kool-aid/?sh=b4da90534e3e
ps. apologies if you were being snarky and I misread your post ????