I hope the butter was from grass fed cattle. :>)
This is all in your head. Eating a pound of butter is a stupid thing to do, but just doing it once isn't going to have any long-term effects. Also, at least to my knowledge, dairy doesn't have that much to do with estrogen -- it's pretty far down on the list of foods that are estrogenic. The main problems with dairy is that most people aren't born with the enzyme to digest it, or are allergic to it, or have an intolerance to it, and it's very high in calcium but very low in magnesium which can leave an imbalance if not make up by eating other foods very high in magnesium. Also, of course, butter is mainly fat, and eating too much fat isn't the greatest idea, but there are worse fats than butter. Most important lesson: if you see it on the internet, your natural skepticism should kick in. Unless you like being a daredevil.