A plea to certain individuals:
Please don’t lecture women on how to dance. Women come to salsa to dance, not to have their ‘faults’ explained to them, and some of them are put off dancing altogether because of this behaviour.
If a woman hasn’t asked you for a private lesson, your dancing should do the talking. If she can’t follow the lead, maybe you need to improve the lead. Or maybe the move is too difficult for her level of ability, in which case you should use simpler moves rather than stopping the dance and lecturing her.
Unless she specifically asks you for advice, leave the teaching to the people who are paid to do it.