I think because you're missing the point - which was on topic. It wasn't about the "F", it was about the teacher's reply to KV's essay about himself, saying th

I think because you're missing the point - which was on topic. It wasn't about the "F", it was about the teacher's reply to KV's essay about himself, saying that the author (KV) didn't know anything about KV . Missing that wouldn't cause the downvotes on its own - but combined with comment about the offtopicness probably did it.