I do think that teaching DDs to think 'Bwhahaha, LOSER' every time a man does something red-flaggy would be good. And also, showing DDs that we love them and value them and that they are good, worthwhile people even when/if they make mistakes - basically giving them self-esteem and reasonable boundaries. Someone who has been raised by reasonable, loving, good parents will usually have enough self esteem to be able to say 'Actually, fuck off, I won't put up with mistreatment'. Unfortunately, abusers do have a kind of radar for people who are already vulnerable and some abusers have a finely-tuned radar for the person who appears strong but has a major weak spot.
Really, the most important lesson to teach young women is it's fine to be single. You do not need a heteromonogamous relationship to make you a real person. Couplehood is not actually that much fun, and it's only worth giving up the joys of the single life for a partner who is really good-quality.