What Jackie is trying to tell you, in her genteel southron lady way is that, yes US'ns pronounce the R in that oh so exquisitely non-musical way that only US'ns can do. Some dialects in which the R is not pronounced, notably southern and northeast New England dialects, will elide this R and you will hear something not unlike the Received Standard British pronunciation.

Many of us are fully aware that this results in a non-grammatical use of the second person plural form of the verb to be with the first person singular pronoun be we have gotten used to it.