I can’t stand the snarky smugness of this personality. To me it is just nails on a chalkboard.
You're right. With every toss of the head, every wide-eyed sneer, every stretch of that giraffe-neck, every 45-degree-forward lean on an elbow (the better to appear to be confidently in your face, my dear), with every pseudo-intellectual contrivnce of sophistry -- (he, she, it) epitomizes childishness). A thinking person should really see a few minutes of it just to be informed; but it is really hard to take for very long.