Why is it ok to be prescriptive with things like spelling of words but not grammar or the meaning of words? If people are using words in a way that doesn't make sense to the reader, such as changing the meaning of them to be the opposite like the word factoid, it's not the reader that is wrong by pointing out that the word has a different meaning than intended. I have no problem calling out such use as being wrong.
> Why is it ok to be prescriptive with things like spelling of words but not grammar or the meaning of words?
It's not.
> If people are using words in a way that doesn't make sense to the reader, such as changing the meaning of them to be the opposite like the word factoid, it's not the reader that is wrong by pointing out that the word has a different meaning than intended.
The reader can say "It was unclear", "I didn't like it", or "that seems like it's opposite to what I would expect", but "wrong" is a silly thing to say. None of these things are even absolute within published English literature, let alone just say American, or UK, English literature. Even if you're following a particular style manual things are ambiguous in many cases.