It is, but it's still significant. 13% for whites in the US but rising to near 90% for some ethnic groups.
Europe varies greatly, with by far the highest level of tolerance in Northern Europe (I'm Norwegian, and I didn't even know about lactose intolerance until I was in the 20's - it just wasn't something that became a subject until we were exposed to more immigrants as while it existed in Norway before that it was <5%), with lactose intolerance increasing to well above 20% in many other European countris.
In any case the advice to down vast quantities as milk isn't universally applicable anywhere.
Europe varies greatly, with by far the highest level of tolerance in Northern Europe (I'm Norwegian, and I didn't even know about lactose intolerance until I was in the 20's - it just wasn't something that became a subject until we were exposed to more immigrants as while it existed in Norway before that it was <5%), with lactose intolerance increasing to well above 20% in many other European countris.
In any case the advice to down vast quantities as milk isn't universally applicable anywhere.