If a cow drinks milk is it considered cannibalism

...or to answer your question directly and specifically without resorting to incidental analogy (though they have a point !). Cannibalism is consuming, at least partially another member of the same species. Drinking nourishment from another individual does not come under this, so this is not cannibalism.

Uhm, Human babies drink their mother's milk, is that cannibalism?

Seriously, that's the only question you could think of?

Dumb.

Do babies drinking mother's milk classify as cannibals?

What do you think farmers feed the calves?

no, human babies drink boob milk and theyre not considered cannibals so i dont see why cows would be either

It's like drinking your own per