Similar to any famous individual, Kant faced criticism both during his lifetime and after his passing, even from prominent figures.
Specifically, shortly after the renowned philosopher's demise, his colleague Johann Daniel Metzger, a professor of medicine at the University of Königsberg, hastened to publish «Remarks on Kant, His Character, and His Opinions by a Fair Admirer of His Merits,» where he criticized and reevaluated the idealized image of Kant.
Furthermore, as Kant's posthumous fame spread worldwide, his works attracted detractors abroad.