I think part of the problem is that people see the same grammatical mistakes repeatedly and think it's normal; especially since it seems most of the written content people consume is written by the average person and not edited (TikTok, YouTube, Instagram etc). So they honestly don't know what's proper or not.
For example, I've seen multiple YouTube shorts in which people pluralized words by adding " 's" to them. Someone I met recently thought the same too.
Not sure if there's a solution since grammar and spelling aren't things people care about. Can't force people to have better written content if their viewers don't care or know any better.
But I want a peanut