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Wow...I know a lot about dairy allergies...being allergic to cow's milk since birth...
First. Lactose intolerance and dairy allergies are two entirely different things. Lactose intolerance comes from lacking an enzyme that breaks down lactose. Dairy allergies arise from the bodies' reaction to certain proteins in milk.
Second: While in some people dairy allergies cause stomach aches, most people with the allergy will present with typical allergic reactions...I've know kids that sneeze when they drink milk. Personally, I develop a weird throat congestion problem when I have too much. Further, like any sort of allergy, some people need a lot more exposure before they have a reaction. Total aversion to dairy is only really necessary for those people who react very acutely and with reactions that are more likely to be life threatening. For example, I can usually have milk on my cereal in the morning, be fine all day and then have a small bowl or cone of ice cream after dinner and have only mild symptoms.
Third: the vast majority of people (greater than 80%) will slowly develop lactose intolerance as they age. The body tends to slow production of lactase as one ages, making dairy harder to digest.
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