I, along with many people, have a milk allergy. I get my calcium other ways without the negatives which I largely adapted to but only because I got use to the poorer health consequences.
The below vid is by a pretty interesting (though lacks charisma) fellow who gives a fairly simple test to tell if you have milk allergies. Lots of personal research content too.
Oh, and I find better health begins with the ability to ask better questions of one's self. "Is milk good or bad" seems to me to be a poorly constructed question.
YouTube - Nutrients for Better Mental Performance