What’s really funny is that in asian culture, food is so diverse that no one really can tell if they are lactose intolerant or not. Personally I had a hard time figuring out if I actually was lactose intolerant even until now I am still not sure.
For people like me who want to know maybe you can do a test: eat or consume any dairy products and then wait for maybe an hour up to three hours or so and see if you end up in the bathroom