I usually don’t answer to this kind of threads and just ignore “Grammar Nazis” but since you genuinely seem to want to know, I will try to give an explanation that maybe not everyone could give.
I am half Swiss /half Brazilian, so German and Portuguese are my native languages. with 4 years I basically spoke both languages fluently and even picked up some Arab on the way because my parents had Egyptian friends.
Instead of trying to have any empathy for the fact that this is actually quite amazing, people kept making fun of me for messing up the letters being slow at reading and writing… I had some light form of dyslexia and also developed ADHD which I now know probably came from super high sugar consumption, which only made matters worse.
Non of this was diagnosed, since this was not really common at the time, you were eighter a smart or a dumb kid.
The bullying (teachers and other students alike) really kept me from wanting to read anything, enjoy studying and expanding my horizon (which is now my biggest goal in life)
I now can speak 4 languages and am learning a 5th one just for the fun of it, I fought to get my joy of reading back and developed strategies to improve my grammar.
I am not perfect at writing in any of them but I acknowledge that I am not dumb, but that my talents lie in other parts of life and I do what I can to improve, but I also rather spend my energy on more productive matters than worrying about an extra ‘o’ or an ’ in the wrong spot.
Small words can have great impact on people and cause years of suffering and self doubt.
And there is no way to know what a person has been trough and that such “small and easy thing” might not be easy for someone else.
Just some food for thought