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Are the Spongebob examples you mentioned actually posted as ME Hs? If so, its misuse. The MEH is when a character does something so bad they're rendered irredeemable in the minds of the audience.
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We have forum topics to discuss tropes like these. Talking about it here won't serve any purpose. MEH is by definition a line that cannot be crossed back over. If someone is listing Mrs. Puff as having an MEH, they are badly misusing the trope and need a good spanking.
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The YMMV of demolition doofus called mrs puff's actions as a moral event horizon
I've thought about the MEH and I've been bothered by its description. It's states that when a person crosses it, they are irredeemably evil. Ok huge problem, there are some cases where a character might cross it a few times but still have audience sympathy and does have genuine good moments even when crossing, I think it shouldn't state the person is irredeemable, it should mean that the Event is unforgivable. Because saying irredeemably evil means that that person will always be evil even when they don't do anything antagonistic. Like Mrs. Puff for example, yes she try to kill Sponge Bob but one could argue who was the victim there and she still had nice of at least civil moments even after that episode. Another examp!e is squidward, yes he's a jackass and has crossed it a few times but he still has some audience sympathy and not everything he'll do in the future will be evil or antagonistic