I mean, really depends on the region for lactose intolerance:
Worldwide, about 80% of people experience some form of lactose intolerance as they age past infancy, but there are significant differences between populations and regions. As few as 5% of northern Europeans are lactose intolerant, while as many as 90% of adults in parts of Asia are lactose intolerant.
Neither one of which is all that common compared to the rest of the population.
I mean, really depends on the region for lactose intolerance:
https://en.wikipedia.org/wiki/Lactose_intolerance#Epidemiology