Downvoted? Yes. Intentionally? No.

If someone else posts a better comment that renders mine superfluous, I’ll often delete mine. But if someone else has already replied to mine, I’ll leave it for the sake of context but downvote it so the better one gets more visibility.

Why would I? I’d rather just reply to that comment/edit it and say something like “my bad, I brainfarted and misunderstood everything!”.

no