Nothing says "living document" like "living document", and unlike the "I have a constitutional right to do drugs" red herring, there are people who actually do say that it's a living document, some honestly and outright and others try to sneak up on the idea but always to the same end.
Well, it is a living document if you're talking about the ability to change it via the amendment process. So maybe you shouldn't be so quick to criticize.
Now, if you mean "living document" in some other sense, you'd better get a whole lot more specific as to what you mean and who said it. 'Cause I never did.