A sign of some sort of immaturity that can only be remedied by ensuring they like only things that girls tend to like stereotypically. The point is to not be ashamed of interests that are viewed as masculine or are derided by a particular sort of miserable person as immature, stupid, toxic, etc. My favorite thing about Sokka is that he makes every kind of mistake imaginable, exactly once. Everybody else in the gaang starts out with a handful of real strengths but a bunch of mistakes they keep making over and over again.