Nah, you haven’t outraged me a SS/LE. But I don’t believe that Lily’s Patronus was every stated and don’t know how Harry would know why Snape’s Patronus was a doe because of Lily. It seemed to me that it was just his guess. I believe in an interview JKR said that Lily’s was a doe because she was so into James. But then again doe’s and stags are different species. A doe wouldn’t mate with a stag but with a buck. A stag would mate with a hind. I think. It is all to confusing that I just have my own interpretation.