Firstly, I'll care when it stops being so common that it happens at a rate of about 1 page in 5 in most threads.
I expect folks will care if we start handing out warning points for it, or turn it off entirely. Won't that be fun?
Second, this particular case wasn't mocking.
Perhaps, but clearly, it came across as if it was mocking anyway. Given that, do you think that a plain flat denial, without so much as a "Oh, sorry about that," is apt to be convincing or constructive?