[lettergram]

Just going to go ahead and say it, strait is a word as is straight. The article was titled "Please Excuse my Grammar" and misusing a word is a grammar (not spelling mistake). That also seems to be part of the point of the article, did you read the last line?

The author wanted to misuse grammar to bring attention to the fact that the education system doesn't support learning. Instead the system labels individuals and attempts to keep them in those labels, rather than helping them improve.