This honestly doesn't sound too accurate. It depends where you are in the world.
I think porn is to blame for a lot of the perception and opinion on penis size. Obviously, people (men) want a bigger dick. Its a huge confidence boost, it does work for you, and people can't give you shit for not having it.
The average size in asia (represented by all the porn I watch.) is relatively small. I think that I"m small in north america comparing myself to white and black porn studs, but I feel large when I watch Asian porn.
For reference my dick's 7.5 and I have self esteem issues thanks to all the giants I see in porn. (And all my other self esteem issues probably don't help lol.)
For a further anecdote to support if size MATTERS however, that same foid I mentioned above has slept with a 11 incher, and she said he was a 2 pump chump. Lasted under a minute every time they did it. "Best sex of her life without a doubt." She might be a size queen, or size might just be that thing that makes up for other deficiencies.
For the record, she says she cums the hardest when she masturbates, and no penis has ever compared to just pleasing herself. Every woman is different, just like every guy, so take it all with a grain of salt. When it comes to sexual organs everyone has their own tastes. If no guys below 6' ever got laid the population of asia and india wouldn't be the fucking elephant in the room.