I'm not grandparent but no one drinks pure milk in my environment.
I've only seen that in American movies (I'm from Europe).
I have a friend who used to drink milk as a teenager and had to stop because it caused some complication. This was 20 years ago, I don't remember the details.
It's pretty common to drink pure milk in America, if you're lactose tolerant, which the majority of the people here are. Not everyone does, of course, but it's not unusual here by any means.
I've only seen that in American movies (I'm from Europe).
I have a friend who used to drink milk as a teenager and had to stop because it caused some complication. This was 20 years ago, I don't remember the details.