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Americans are the ones who use fiance, fiancé, and fiancée interchangeably. It's far from the worst usage issue of which we are guilty.
I always watch my spelling and my grammer, and get ticked when other people don't. For example, it drives me crazy when people misuse:
Then-Than
there- they're- their
to-two-too
Quite-quiet (yes, believe it or not)
which-witch
wether-weather-whether
And I hate it when people say things like "she has went." Please.
But, then, I'm Canadian.
And I have studied grammer pretty deeply in my ESL class a couple of years ago, and in Israel.

I have issues with correcing people- I know they hate it, so I try not to, but sometimes I can't help it.
Julie

Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be?
Scully: I only get five?
Mulder: I remembered your birthday this year, didn't I, Scully?

(The X-Files)