Have you ever heard someone say something like "Well, that idea is just silly, nobody in their right mind would believe it!"? That's called an appeal to ridicule, and it's when someone makes fun of an idea or argument instead of actually explaining why it's wrong.
It's a bit like when you're playing with your friends and someone suggests a game that you don't like, so you make fun of them for even suggesting it. Instead of saying "I don't think that game would be very fun, let's do something else", you're just making fun of their idea instead of really explaining why it's not the best choice.
The problem with an appeal to ridicule is that it doesn't actually address the argument or idea being put forward. It's just a way of making the person who suggested it feel bad, or making others laugh at their expense. It's like saying "Haha, you believe in that? What a joke!" instead of actually discussing the topic and why you disagree with it.
So, if someone uses an appeal to ridicule against you, it's important to remember that it's not a valid way of arguing or debating. Instead, try to focus on the actual argument or idea being put forward, and explain why you think it's wrong or why you have a different point of view.