We've had a few questions like Why do "data types" in computers exist, if it's really all just bits? lately where the question is ranty, but not anything some editing couldn't fix, but in the comments the user who asked the question is arguing and soliciting debate and discussion. Pretty much the textbook definition of "not constructive" except it's the user that's the problem more than the question itself. Sometimes the lengths they go to in defending a specious argument makes me wonder if the asker has some sort of mental illness.
I think the worst of these cases end up getting purged from the system. At least I couldn't find more examples when I looked just now. In nearly all cases the question quickly gets closed. I've even voted to close after answering some of them myself. However, it sort of seems a shame we can't lock out the original asker but keep the question after some editing. Is there some sort of standard way these situations are supposed to be handled? Normally I'd encourage editing and reopening, but if it's the user being intentionally argumentative it seems a quick delete would be a better course of action.