As always political outreach can change horizons beyond what most people would deem possible. As the tomato is considered a vegetable according to the U.S government (in accordance with laws regulating goods) , however, "scientifically" it is considered a fruit. It would not end there, of course, for furthermore the culinary arts use a tomato as a vegetable whilst cooking. So, its not hard or inconceivable to have a substance such as milk misplaced in the minds of a common man.
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Why is the Tomato a Fruit-
Go ahead and check out this question from Oxford Dictionary
Is a tomato a fruit or vegetable?
Why is Milk a Food
Go ahead and check out this excerpt from InfoPlease
Milk, Food