The message
from "Rupert" contains these words:

if she really says "one" as the subject then forget
the wine:-)

Course she does, "on" doesn't carry the same stilted connotation in
French that "one" does in English. It's a also a delicate French social
courtesy to frame a little correction, or assertion, in the third
person, less confrontational than using the first or second.

You could always adopt the Basil Fawlty way of speaking any foreign
language
which is to shout twice as loud in English.

Well, that would be the best way to alienate the natives and be sure
of being stuck in the expat ghetto for ever. One had better be a very
good cook.

Janet