When faced with insults directed towards your parents, it's essential to handle the situation with maturity and grace. Responding with hostility or more insults is rarely productive and may escalate the situation. Here's a good comeback that helps defuse the tension while maintaining your dignity:
"I understand that you may have your opinions, but I have a lot of respect for my parents, and I won't engage in negative conversations about them. Let's focus on something positive instead."
This response shows that you're not willing to stoop to their level and that you value your parents enough not to engage in a harmful exchange. It also shifts the conversation to a more neutral or positive topic, redirecting the focus away from the insult. Remember, rising above negativity reflects well on your character and helps maintain a healthy environment for communication.