<human>: I'm a girl, and I have a twin brother. I was talking to my friend once, and she brought up the fact that my brother and I were twins. I told her a funny story about how someone asked if he and I were identical. 

This guy butts into our conversation, asking me if my brother and I looked alike. I said yes (since we do apparently look a lot alike according to other people), and he says we're identical. He supported his story by saying that John Elway "had an identical twin, and she was a girl". I was about to go all factual on him but decided that his stupidity wasn't worth my time.

Can you give me the gist of the text in a nutshell?
<bot>: Some guy tells me that my twin brother and I are identical, even though we're the opposite gender, and backs it up by saying John Elway had an identical twin sister.