The confusion here is that "tylenol" in the US basically means just Acetaminophen - technically tylenol 3s have opiods, but most americans know tylenol as the over the counter tylenols, which are just acetaminophen.

In other places tylenol must mean what we think of as tylenol 3

That explains...a lot actually.

Some studies out there linking acetaminophen to reduced empathy.