It's like asking "if someone could prove that creationism was true and evolution isn't, would you agree that scientists are closed-minded in rejecting it?"

For my own part, I don't have a problem with that question either, though how I answer it depends a lot on whether (and to what extent) I think we're engaged in idea-exploration vs. tribal boundary-defending. If the former, my answer is "sure" and I wait to see what follows. If the latter, I challenge the question (not unlike your answer) or otherwise push back on the boundary violation.