[Fomite]

"You're confusing correlation and causation" & "You're drawing conclusions from an insufficient sample size."

Those are the two that drive me nuts. They're statistical arguments, not ones you can just toss out. All causal relationships are also correlated relationships - if you're asserting a correlation isn't the result of causation, it would behoove you to at least have some notion of what might be confounding it.

The same thing with sample size. "Well, their sample size is small..." gets trotted out. How do you know that? If you want to bring statistical power into an argument, come prepared to show your work.