Soy is actually pretty good for you; the idea of soyboys is a political meme and not a scientifically-supported conclusion.

Meta-analyses such as Reid et al. 2021 indicate that soy and isoflavone consumption do not impact testosterone or estrogen levels in men, even at high dosages exceeding what's found in a typical East Asian diet. Clinical studies like Beaton et al. 2008 show no effect from soy protein isolates on sperm count in healthy men. This shows that fears that soy might feminize you are at the very least over-exaggerated and possibly even completely false for normal amounts of soy consumption.

In contrast, many other foods that "soyboy"-mockers are fine with consuming, like dairy milk, may have a far greater feminizing effect. Milk is excreted by pregnant cows and contains estrogen. Consuming milk is associated with significant increases in estrogen counts and decreases in testosterone counts. (Maruyama et al. 2010)

So why do "soyboys" act the way they do and support far-left ideas? It's because they've been influenced by political ideas and not because they've been feminized by soy. As a case in point, the most conservative South Korean Christians and Japanese Nationalists routinely consume soy-based products, and they have not become "soyboys".