I would prefer you come in and not your friend to get the signature.
Above is the sentence in the email I received from my supervisor. I was in another city so I had no choice but to ask my friend to get the signature for me. When my friend came to see her this morning, she seemed angry and repeat the word "prefer" again.
I was just wondering that if the word 'Prefer' could have the meaning of 'necessity'? And if so, how can I tell?