In a way, both of you are correct. The dialect of American English has changed a lot over the years, and will continue to change.
Heck, the dialect is different just from one state to the next sometimes.
I would say that that specific exclamatory sentence is not as common today as it was back in the day. (Maybe around the 1950's or so?) This is just my own personal opinion though. I have known a couple people over the years that talk just like that though.
At the end of the day, I believe it to be a matter of preference than anything else. As long as your point is being understood by the masses then use whatever wording is most comfortable for you.
Good luck to you in your journey through American English. English is my native tongue but I have heard and read a lot about the varies difficulties in learning English as a 2nd/3rd language.
If you take the time to really think about it you'll come to the conclusion that American English is ridiculous. Just the phonology, homonyms, and homograms alone will made my brain hurt. I never really took notice of, or focused on the little details that make up the language. It become so second nature to me that I was unable to understand how someone could live here, and speak the language, for years and still manage to have strange or confusing sentence structure.
My stepmom, for example, would say "The shoes of your father" instead of "Your father's shoes". And she has been living here for over 12 years.
I commend you and all other non-native English speakers. I am glad that it is my first language, if not I would fail miserably trying to learn it. I often joke around about my lack of language learning skills by telling people that "the only language I know is English and half the time I can't even speak that correctly"