all in the Kool-Aid and don't know the flavor

slang Involving oneself in something one knows little or nothing about. You weren't there, so would you quit commenting on my fight with Sue? You're all in the Kool-Aid and don't know the flavor! Who gave you the right to comment on my relationship? Man, you're all in the Kool-Aid and don't know the flavor. You're all in the Kool-Aid and don't know the flavor, clearly. You don't know half of the things that he's done to me over the years.