Perhaps for a lot of people… English is not their native language? (Including me). Grammatical stuff will always be iffy, even in peoples own native language. I even mess up grammatical stuff in my native language, lol.

That’s not all… auto correct helps with everything these days and thus people usually don’t really think anymore about what is the correct way to write a word. I suppose.

Though, why do you get so upset about something like this? Just boils your blood for absolutely no reason. It’ll just keep bothering you while you can’t solve the problem. Good luck.