An answer to creationist's attacks on c-14 dating:
http://ncse.com/cej/3/2/answers-to-creationist-attacks-carbon-14-dating
Yes you can try to shoot down their pathetic excuses for ignoring C-14 dating, but they always tend to retreat to the excuse of: "Satan altered it to test us" or "God-magic changed everything".
Really you have to point out that there are many many reliable corroborating methods of archaeological dating. If someone is willing to dismiss so many multiple lines of evidence under the excuse of "God-magic", then they are beyond reasoning and it means God is playing a total game with us.
https://en.wikipedia.org/wiki/Dating_methodologies_in_archaeology