Answer:
Explain how ignoring in any form wouldn't be advantageous at all.
Explanation:
Ignoring any person's/child's feelings, no matter how negative or aggressive, can lead to dangerous outcomes, and they would probably feel ignored, leading to self-isolation. Another outcome could be that they would begin to ignore you, and debates would become arguments, and arguments become rejection. If the parent persists, ask them what good would come out of ignoring, then ask them if it's worth it.
Also I'm 17 so don't kill me, this is just personal knoweledge