I think the honestThe answer ismight be best viewed through the teachings of Karl Popper, notably the Falsifiability Criterion, according to which anything scientific has to supply a self refuting empirical criteria. That is, in the absence of an empirical way to test the hypothesis -- upon failure of which the theory is refuted -- the theory in question is hereby not falsifiable, hence not scientific.
As presented, this could be an ideal behind scientific making. As such, it may be perceived as a defining characteristic to which science always aspires, doesn't always achieve. As Creationism assumes the existence of god, it is not falsifiable (There isn't, by any definition, an empirical test upon failure of which we deny the existence of god) and as such it is being demarcated from the natural sciences.
I disagree that
The practical rebuttal is to block the philosophical lures and give a sociological answer ...
in an attempt to win the debate over the current state of affairs, as there is simply no need to give in to such historico-cultural matters in this context of knowledge. Claims such as The Incommensurability of Scientific Theories, whether formulated by Fayerabend or as it was plagiarized from Polanyi by Kuhn has long been given strong rebuttal themselves -- see Davidson in hereDavidson in here for example.