Earlier quoted context omitted.
There's a difference between "int i = INT_MAX + 1 is legal C" (appropriate but factually wrong) and "fsck off, you moron".
...but then, what is the difference between an opinion you disagree with (a "dissenting view") and one that you believe to be factually incorrect? I feel like downvoting the former "factually wrong" comment leads to the behavior that ColinWright is describing: where people downvote anything they disagree with. (One might even argue that this is a fundamental bug in having downvoting as a mechanism.)
On the other hand, "int i = INT_MAX + 1" is factually wrong, and you could link to the standard to prove it. Similarly, "the Sun orbits the earth" is factually wrong (to the extent that it's meaningful, at least).
Yes, there are edge cases, and yes, people tend to think that what they believe in is "obviously" the only right thing to believe in; but that doesn't mean that there's no difference at all.