I read somewhere that certain places have a very large amount of people with lactose intolerance, like north America. I used to drink raw milk, straight from the bucket my grandma used to milk the cow. Never had any issues. Grew up on a farm in Romania in the 80s.
Not just lactose, raw milk can contain all sorts of nasty stuff. Seems like you probably had super healthy cows, a good immune system, and a healthy dose of luck.
Grew up working on a dairy farm, definitely drank raw milk and didn't shit my guts out. It would if you drank, like, a LOT of it. But seriously you'd have to drink more than a cup or so.