Well, your statement is vague. It could either mean:Most creationists are impervious to evidence and argument, or:
All creationists are impervious to most evidence and argument.
I have specific problems with both of these statements.
The position of 'largely' before 'impervious' rules out the second interpretation. And to expand on my statement, where are the articles published by ID writers in peer-reviewed journals of biology and paleontology? Where are the compilations of the evidence that would force reasonable evolutionary theorists to abandon their views on how life developed? I've asked on earlier threads for links to such articles and compilations of evidence, but have received no responses.
And I must insist that "that's not uncommon, these days" is in fact a generalization. Perhaps it's supportable by evidence on FReeper threads, as you say, but it's a generalization nonetheless.