Sorry, I didn’t get the joke. Thank your for your explanation.

At the risk of over-explaining -

I think the other commenter was (possibly) kidding about it being a white flag, because over here (US) the only place most of us have seen a white flag used to surrender is in cartoons and such for the most part. (I think this is probably true elsewhere today also.)

I was surprised when I learned they really had used a white flag to surrender at Appomattox and (out of disdain for the confederates) I find it super amusing that the white flag they used was literally a dishtowel they had on hand.