You don't have to be oblivious to them, but it's a fine thing to aspire to as a Dork Diver.
It's not fun to obstinately resist rude kibitzers; while it's an acceptable place to begin, as you progress in your Dorkdom, you will become more adept at ignoring rude NDDs (when necessary) with basically no effort whatsoever.
It's like diving in relaxed, comfortable trim. In the beginning, you're practically forcing yourself to do it, but with time and practice, eventually you get to the point where you can just hover horizontally without conscious effort, and then your diving trancends into a whole new realm of relaxedness and fun.
(I'm to the point where sometimes I don't even do the internal sigh and behind-the-back eye roll anymore when I'm faced with a terminal NDD. It takes quite a bit to break my funcentration.)