excerpted from an article
by Dr. Aria Nosratinia
Never blame a partner for missed execution of moves.
Regardless of who is at fault when a dancing mishap occurs, both partners are supposed to smile and go one. This applies to the better dancer in particular, who bears a greater responsibility.
Accepting blame is especially a nice touch for the leader. But, at the same time, do not apologize profusely.
My personal preference is the following: whenever something untoward happens, as a leader, I first see if my partner noticed. Sometimes, the follower may not be aware; for example, that a move was slightly off-time or that a fine point in technique was missed, in which case it is better to let it go. If the follower has noticed, I just smile and whisper “sorry…” and go on, regardless of whose fault it was.