Not questioning it? You literally said he didn't understand a thing. You questioned him the moment you quoted his post which was a factual statement as the Silver Covenant is not a race.
You claim it has zero value, but if this was the case, you wouldn't have quoted him to begin with. It's clear you hold value to what he said because it goes against what you believe/like regardless of the fact that's it's true.
It's really not a big deal, I suggest moving on and discussing how High Elves can be reasonably added to the game.