Yikes, I wish there were a way to immediately retract an inadvertent comment flag, @quid. I was trying to flag a comment (below the question)
here written by the asker, But my "click" on the flag landed on the grey flag beside Joel Reyes Noche's comment. I did not know that until after clicking in the pop-up that shows after clicking a flag to explain the flag as "it's unfriendly or unkind".