* AllAdultAnimationIsSouthPark: Averted. He was around long before ''SouthPark'' was even a gleam in the eyes of [[TreyParkerAndMattStone their creators]] (he nearly sued them because their character of Mr. Hankey was too similar to an idea he'd tried to pitch) and, despite his juvenile, off-the-wall humor, hasn't had quite as much vulgarity in his work as many would expect him to... that is until ''[[WesternAnimation/TheRenAndStimpyShow Ren and Stimpy: Adult Party Cartoon]]'' came along and he was [[ExecutiveMeddling pushed]] [[RatedMForMoney to do wall-to-wall vulgarity to compete with the rising popularity of]] ''WesternAnimation/SouthPark''.
* [[AllAnimationIsDisney All Animation That Looks Like John K. is John K.]]: There are a handful of animations out there which were either influenced by or ripped off his style, such as ''WesternAnimation/{{Flintstones}}: On the Rocks'', ''WesternAnimation/TheHauntedWorldOfElSuperBeasto'', ''WesternAnimation/TheLooneyTunesShow'', many of which were made by former Spunco employees but John himself had nothing to do with.
* BaseBreaker: A lot of his more recent cartoons, but notably Adult Party Cartoon. Fans weren't impressed by seeing figures from the childhood in such an adult cartoon, even for characters as subversive as Ren and Stimpy.
* BrokenBase: Fans of Ren and Stimpy that aren't impressed by his adult cartoons, versus fans that don't mind.
* LoveItOrHateIt: He's either a brilliant cartoonist who rejuvenated the animation industry by reintroducing "cartoonie" cartoons or an [[SmallNameBigEgo arrogant fanboy]] who [[PromotedFanboy got lucky]] because he worked with RalphBakshi.
* NeverLiveItDown: He has deeply regretted some of the decisions he made in his works, such as his use of eyes that squish in the middle to form a ) shape (which he only meant for the storyboards and never actually wanted them in the final cartoons) as well as many of the mistakes he made in his cartoons, such as one scene of Stimpy's eyes defying proper perspective (which was a sloppy mistake, but "everyone thought it was on purpose") and claiming that many TV cartoons (such as Animaniacs) had made "whole styles out of his mistakes."
** In fact, he encourages fans *not* to study his work, and instead look at his influences for education, such as Bob Clampett.
** His reputation as a show runner never recovered after his ego got the better of him during ''Ren And Stimpy'', and he's yet to make more than [[WesternAnimation/TheRippingFriends one attempt]] at another series.
* ScapegoatCreator: He is largely blamed for the failure of ''WesternAnimation/RenAndStimpy: [[DarkerAndEdgier Adult]] [[HotterAndSexier Party]] [[RatedMForMoney Cartoon]]'', with fans claiming that [[ProtectionFromEditors he got too much creative freedom]] on the latter which "ruined" the show--even though John has pointed out that the show still went through ExecutiveMeddling and censorship (this time, through Spike TV instead of Nickelodeon, though both channels are owned by Viacom, so it's really a case of "same shit, different dump"), forcing him to put in [[RatedMForMoney excessive adult humor]] to compete with ''WesternAnimation/SouthPark'' (though, at the time, ''South Park'' was at that point where it was mixing in social commentary with its gross-out humor and taking it beyond fart jokes from the 1990s) and Creator/AdultSwim (which doesn't really delve in gross-out humor. Adult Swim's humor is laden with pop culture references, DeadBabyComedy, and/or bizarre, non sequitur humor).