I have not noted his comment history so I'm only addressing this in a general fashion:
A lot of things actually are black and white, but people invent shades in them in order to avoid having to admit there's a problem without a solution. I've been accused of black and white thinking many times, almost never has the accuser been able to actually show a nuance to the situation.
My issue is with people who take this to the extreme and apply it to the vast majority of their responses, the so-called "know-it-alls" that Dunning & Kruger told us about.
I think if we want to be seen as truly intelligent, we need to have much more humility and empathy, and accept that we can't know everything about everything, and not try to act like we do.
> almost never has the accuser been able to actually show a nuance to the situation
I accept that that has been your experience, but I don't think it applies to everyone, not even close, and I think it also doesn't mean that they were wrong, they may just be unable to articulate a better response than you.
A lot of things actually are black and white, but people invent shades in them in order to avoid having to admit there's a problem without a solution. I've been accused of black and white thinking many times, almost never has the accuser been able to actually show a nuance to the situation.