Not blind, but to make a really stark example, there's a difference between mocking someone when you have a gun to their head, and mocking someone who has a gun to your head. The former is just adding insult to injury, the latter is stupid but a little brave at the same time.
In the former example you have so much power that whatever cause you had to denigrate them no longer matters to you, but that is neither the common case nor principled.