Well if he can't even show off in the only thing he apparently is good at, moreover people are pissed if he tries (well yeah that smirk is annoying though) , there isn't much for him left, is there?
The "midget guy" is the opposite of him, always reliable, always there with a helpful advice, so it's no wonder he would be more popular then someone who is constantly pampered by his younger sister. Wasn't the sister's friend into younger looking boys in general, wasn't she obsessed with her little brother, conveniently called shota? He never had a chance to begin with.