Asses our biology and what we appear made/evolved to eat. What we can better chew, digest, etc. Our biology is far closer to that of herbivores, for example.
And many of us can indeed digest milk. So by using your own reasoning, milk is an okay drink for many people.
No other animal really eats/drinks milk products after weaning.
-No other animal eats vegetables and fruit that have been selectively bred specifically for their use either. Does that mean we're not "supposed" to eat corn?
-No other animal uses electricity. Does that mean we're not "supposed" to use electricity?
-No other animal writes books. Does that mean we're not "supposed" to write books?
Over 70% of humans cannot digest milk properly
Which says nothing to those 30% who can. You might as well argue that since some people are allergic to peanuts, no one is supposed to eat peanuts either...
and there is zero evidence that milk in any form is good for us. A major problem is that most of the 'studies' done have been funded by the dairy industry to forward their profits.
Milk contains nutrients that our bodies can use just fine. If you're going to bash milk because consuming too much of it has negative side-effects, then you'll have to bash just about all foods. Even fruit has a lot of sugar that can be harmful if you eat too much for too long.
Humans are animals just like other animals and we have a set diet.
And yet milk can be digested by a lot of people.
But I still think it's kind of sick that humans have now evolved to drink milk from another animal. If you really think about that it's gross and totally abnormal.
So? Your "gross" and another person's "gross" are not going to be the same. I think broccoli is gross but I don't use that as evidence that broccoli should not be eaten by anyone. "Abnormal" is also relative: by definition it does not apply in a society where drinking milk is the norm.