First of all you can’t debunk something that’s not bunk. But don’t let that stop you. Here are a few tips.
• Employ vague, subjective, dismissive terms such as "ridiculous," "trivial," "crackpot," or "bunk," in a manner that purports to carry the full force of scientific authority.
• Keep your arguments as abstract and theoretical as possible. This will send the message that accepted theory overrides any actual evidence that might challenge it -- and that therefore no such evidence is worth examining.
• By every indirect means at your disposal imply that science is powerless to police itself against fraud and misperception, and that only self-appointed vigilantism can save it from itself.
• Portray science not as an open-ended process of discovery but as a pre-emptive holy war against invading hordes of quackery-spouting infidels. Since in war the ends justify the means, you may fudge, stretch or violate the scientific method, or even omit it entirely, in the name of defending it.
• Reinforce the popular fiction that our scientific knowledge is complete and finished. Do this by asserting that "if such-and-such discovery were legitimate, then surely we would already know about it!"