The flat earth crowd - oops, I mean the "Young earth" crowd, will discount anything that doesn't agree with their pre-conceived ideas.
Well, if these finches are any guide, it will only take about 20 generations for the flat earth crowd to develop smaller brains [if at all possible]. Do not lose hope.
This is that same argument made against Ann Coulter.
Explain how the same species, demonstrating smaller average beak size is a sign of evolution. If there were no smaller beaked birds in the general population a few decades ago, there might be an inkling of an inkling of a chance that it signalled the beginning of a possibility of some form of evolution.
Your comment is a prime example of how you "old earthers" will jump on anything to help bolster your point of view, even if it really does no such thing. All this shows is that those with smaller beaks get more food and are stronger and more viable, therefore more likely to breed. The result is more birds with small beaks. Of course, I guess it all comes down to what the meaning of "evolution" is (if you can decide the meaning of "is" too).
Evolution is pre-conceived. Rule #1: There is no God.
On the other hand.. the "tall tale crowd" will discount any new or old thing that advances the tale.. if it seems logical..
"The difference between fiction and reality is that fiction has to make sense" - Tom Clancy