I am sorry, but both of you are wrong. Penis size and size insecurity is one of the biggest problems facing men and humanity today.
Look at incel/MRA culture. Do you really think any of those men have anything larger than a pinky between their legs? What about the declining birth rate in developed nations? Would that really be happening if all men had big dicks?
The small penis problem is humanities third great existential crisis of our age.
Do you really think that incels represent the majority of men? Or even a significant number of men? How can their insecurity, assuming it is caused by a small penis like you've claimed, be one of the biggest problems facing men and humanity unless incels are a significant portions of the population, which they absolutely are not.
There are many, bigger problems facing men and humanity, some people having small penises does not have a place on the list. Climate change, war/violence, disease, famine, racism. The minute possibility of a large asteroid crashing into Earth is a far more significant problem to men and humanity.
Birth rate has nothing to do with penis size. Developed nations have decreasing birth rates for a number of reasons, none of which are penis size. Implying otherwise would indicate that anyone who has a big penis must have lots of kids, that's not the case. Besides, less people is the best thing we can do for the world and will help reduce some of the problems that we already have.
I'm not trying to be insulting, but I feel like your world view is based entirely on what you see on the internet and not reality. I think you need to take some time away from your computer and get out and talk to people some more, maybe it will help you get a better grasp on reality.