Even poop is not that dangerous to you, if you're not immunocompromised. It's just pee has even less bacteria in it, essentially making it kind of safe for human consumption in limited quantity. The ammonia in it is not good for you, and can cause poisoning, so don't replace your hydration with the pee of your significant other.

It's more the fact that shes arguing that pee is not a waste product despite saying its produced by the filtration of blood. You know, filtering out the waste. But like I said, there are certain types of people (and its not limited to one country or culture) that just won't listen to logic.