If you’d like to protect your daughter, raise her in such a way that she can protect herself. Give her the tools to decipher a dangerous situation. Teach her the language of consent and how to exit a situation that makes her uncomfortable. Help her be confident about her decisions, and show her how to make good choices about the people she spends time with. Take the time and be involved in her life. Protect your son in the same ways. And, for goodness sake, if you have good reason to distrust their judgement, make sure their activities are safe and monitored.
This is rape culture, straight up.
What she is really saying is that when her son coerces and cajoles a girl into having sex with him when she really doesn’t want to, it’s the girl’s fault, and that she should “make good choices” instead of being raped. Because, after all, her son is a member of the patriarchy, and he should be allowed to have sex with any girl he wants, whether she wants it or not. And if she has her father create a safe space for her to do that in, that some how injures her son’s privilege to invade any vagina he wants.