True about Hops, but I think that there is much more to worry about that is unnatural in our environment. Chemicals such as pesticides, plastics, and even laundry soap just for starters, all have estrogenic compounds or mimic estrogen.
http://www.worldandi.com/public/2001/October/ee.html
http://www.kitchendoctor.com/healthc...sestrogen.html
Also, I am more concerned about fluoridated water being used to brew the Beer.
Beer is good. Don't blame the Beer!
It's just best to avoid as many chemicals as you can to avoid estrogen and drink a natural non-chemical microbrew, or brew your own.