Mine is people who separate words when they write. I’m Norwegian, and we can string together words indefinetly to make a new word. The never ending word may not make any sense, but it is gramatically correct
Still, people write words the wrong way by separating them.
Examples:
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“Ananas ringer” means “the pineapple is calling” when written the wrong way. The correct way is “ananasringer” and it means “pineapple rings” (from a tin).
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“Prinsesse pult i vinkel” means “a princess fucked at an angle”. The correct way to write it is “prinsessepult i vinkel”, and it means “an angeled princess desk” (a desk for children, obviously)
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“Koke bøker” means “to cook books”. The correct way is “kokebøker” and means “cookbooks”
I see these kinds of mistakes everywhere!
I think it’s precisely because there is no governing body for English and all the rules are colloquial, developed through usage, that people do get grumpy! They are the only ones who can create and enforce the rules! Each English speaker feels personally responsible and compelled to correct use they perceive is in violation of the rules the way they want them to be. If they don’t do it right then and there, no one else can.