gramie’s comment which didn’t challenge their assertion that the cows were hurt but just went (more or less)
I edited my earlier comment too late: it wasn't effectively asserted either.
late edit
There's also the matter that the comment they were responding to wasn't arguing about morality, since it wasn't clear the top comment was stating a moral position, either.
The top comment merely referred to milk as "crazy" (due to lactose intolerance) & "stealing from cows", which come across as hyperbole for unnecessary when the cows presumably don't care & lack any concept of property rights.
That's where unexpected moralization with rape analogy raised the charm of lemmy as
calm, open-minded, delightfully reasonable
to new, exciting heights.