milk: does a body terrible?

so i was in sam's club today doing some bulk grocery shopping, and there was a woman selling a juicer next to the produce area. she had a loudspeaker and was doing a live demonstration, talking about how many ways to use this juicer. she then said just don't use dairy products with this, and when someone asked why, she said "because milk is for baby cows to grow strong, not people. people were never meant to drink milk and it can only do them harm in the long run." i really wasn't in a mood to engage her, but when i walked by she offered some of her juice for me to sample, so i politely told her that i wouldn't trust any drink being peddled by someone who basically refers to milk as poison. i know there is some debate about milk being for people or not, and lactose intolerance being one argument against, but as someone who drinks half a gallon of skim a day, i'm a fan and realize the benefits. so, any milk haters here, and if so what are your reasons? and fellow milk lovers, what do you say to the argument that milk isn't meant for human consumption?

wow, that may be sillier than the argument i heard from the woman today...