Modern people are the written word as more valid than spoken

Now there's a sentence I can't make sense of.

There is no influence of history in when kids learn to write their language or if they used it orally, they learn to write it then how it's supposed to be written.
If your reasons were valid every Anglo would have problems, they don't.
Since it's noticably the US specifically I can only assume it's sub standard education.
As confirmed by their poor vocabulary compared to other Anglo's