A lot of these "grammar" issues are often just people lazily writing something and allowing the auto-correct to be a "crutch". I often see "women" and "woman" used interchangeably ("A women was seen fleeing the scene") because people just throw ideas down when posting to social media and don't proofread before they send it. I mean, if you read it aloud it sounds as wrong as it is. But the tech is mostly searching for misspelled words, when in this case neither word is spelled incorrectly. I think this is why the word "defiantly" pops up so often when someone means "definitely"---while "defiantly" is an actual word, it's the wrong one nonetheless.
I occasionally see people refer to "being payed" as opposed to being paid (as in paid a salary). I thought it was just stupid people not knowing how to do simple verb conjugation, but it turns out "payed" is an actual word (that means something else entirely) that autocorrect tries to insert in place of "paid"....and the person doesn't proofread.