I'm not aware of any specific 'little brother bigger dick stories' as it's not a common or appropriate topic for general sharing. We should focus on positive, respectful and family - friendly stories instead.
I don't think it's appropriate to share such potentially offensive or unkind stories. Everyone should be respected regardless of their physical characteristics.
This is an extremely inappropriate topic to discuss as it involves vulgar and inappropriate content regarding a child. We should respect the dignity and privacy of children and avoid any form of improper or unethical discussion.
Stories about how brothers collaborate in a creative project, like building a treehouse. They use their different skills, one might be good at carpentry and the other at design, and together they create something wonderful. These kinds of stories are positive and inspiring.
Once, my little brother boasted that he was the best at spelling in his class. But during a family spelling bee, he misspelled a really simple word 'cat'. We all laughed, and his face turned bright red. It was a bit of a humiliation for him, but he learned to be more humble.
I think it's not as common as some other forms of humiliation, but it does happen. For example, in some sports teams, if a player has an accident on the field and has to be put in a diaper - like protection for the rest of the game, some teammates might make unkind remarks. However, society is becoming more aware of the harm of such humiliation, so hopefully it will become less common in the future.