Basically, I'm a nice guy. I respect people's boundaries and do not "flaunt my stuff"-- unless it is absolutely necessary.
However, I also have a secret dark side. I admit that average-size dudes do give me a boost of confidence and unwarranted arrogance. I have won and lost a lot of basketball games and tennis matches, but either way, I always get one-up-manship in the locker room. I don't walk around the locker room naked, but I'll make sure that the guy I just played ball with knows that I pack a big dick.
I have a fantasy of meeting a cocky, loud-mouthed dude and fucking his wife until she cums and screams out that I am bigger and better than her husband. And I want him to know that I know that he knows it-- just to put his attitude in check and shut him up.
Most guys have a competitive nature. It's in our DNA. We get a little rush whenever/wherever we can show-up another guy, expose his inadequacies, make him vulnerable-- whether publicly or privately. Either way, the power play messes with the other guy's mind. And when the dominant guy can get into another guy's head, it can make the subordinate guy just a little crazy and very jealous!
For men, big-dick size can trump anything. The popular MVP athlete with muscles, money, a nice car, and a trophy girlfriend can easily get slammed in the locker room by the most geeky nerd sporting a thicker, larger penis. Every man knows that. And, from then on, no matter what the competition is, that geeky nerd can always say, "...yeah, but at least I got the biggest dick, bitch!" And he wins!
But to be fair, a couple of guys have "turned the tables" on me, too. So, a few times I've been the underdog and know what it feels like-- publicly and privately. I was shocked and almost humbled when I found out that my younger brother has 10"-- but mine is thicker!