Seeing as "(leaky and scrapped) refrigerators are damaging the upper atmosphere, allowing ionizing UV to reach the ground and cancering the everyone," actually happened and AFAIK is disputed by almost nobody, it's not that implausible. Hormones in milk is more plausible still because hormones are known to do that kind of thing, but the main knock against the refrigerator idea is that we already have fairly strong protections against leaky fridges because of the ozone.