It’s nothing to do with “scoffers.” It’s a matter of getting your facts straight. Nothing more, nothing less.
Here’s the thing. You can believe whatever you like about where, when, or how extensive the Flood was. But once you start claiming to have evidence to support your position, there are rules that you need to stick to. And I’m not talking about “uniformitarianism” or “methodological naturalism” or anything like that. I’m talking about the basic rules of honesty, factual accuracy, and mathematical coherence.
A worldwide flood on the scale that you YECs teach would leave clear patterns of evidence. It would have features that are not observed in reality, while features that are observed in reality would be completely absent.