[1]https://www.researchgate.net/profile/Shourong_Shi/publicatio...
...you would have to consume impossible amounts for the smallest of effects
Further, phytoestrogens actually benefit humans
"You shouldn't worry about this because phytoestrogens aren't present"
"You shouldn't worry about this because phytoestrogens are beneficial"
Both can be true at once, and support the end argument, it's just not particularly helpful or harmful if both are true at the same time.
Whereas drinking cow's milk, for example, is high in estrogen because its from it comes from a large female after giving birth.
The FUD being spread around soy is ridiculous.
Other nutrients that tend to be harder to find in plants than animals also tend to be more poorly absorbed than their animal counterparts. B12, iron, d, zinc, etc.
Also, quantity matters. Plants might produce a lot more than mammals do.
In any case, the breast growth on males is no joke. That is just the affect on adults, who are far less susceptible than babies. However it works, soy is a serious hazard and should have the GRAS (generally recognized as safe) status removed.