I disagree, you can teach a person morals and ethics. It might not register right away, and a person might not change right away, but the more it is shown to a person, the more effect it will have on them and eventually that person will choose to make changes in the way they think and live their lives.
We see this all the time in Baalei Teshuva who see the Truth in Torah and the Yiddishkeit and choose to “return” to Torah and its truth and values. We see this in a ger tzedek who chooses Yiddishkeit and Torah because of the way a Jew lives their lives, their moral compass, the ethics and values the Torah teaches, etc.
We see this in anyone who turns their lives around as they grow and mature and build character. We see this even from children who shoplift in stores and learn how immoral this is and grow up to repent and not do things like this in their adult lives.
So yes, you can teach and learn ethics and morality.