you're lacking some basic receptor-ligand understanding. Anything that binds to the estrogen receptor can activate it, and the molecules don't have to even look substantially like estrogen. they need a hydrophobic side, some ring structure, and some side chain specificity to the receptor. phytoestrogens are real. endocrine disruptors are real. it's true that other mammals that we eat have the same hormones as humans. the difference is the concentrations.