There are many medical articles published on peer reviewed journals to counter this myth, it has no basis in reality, and has never been proved. One of those xenophobic-anti-Asian myths from the 60s (similar to the one about MSG).
If you can't find them yourself (the Wikipedia entry is a good start), let me know and I'll provide citations.
Papers and studies sponsored by the soy industry to debunk "myths" published from reputable centers aren't really that great even if someone updated a wikipedia entry to reference one of them.
It seems like a knee-jerk reaction to believe that all those papers are sponsored by the soy industry and everything saying that soy does have estrogen is coming from a reputable source.
If you can't find them yourself (the Wikipedia entry is a good start), let me know and I'll provide citations.