zerozero,
I donīt think many people make a big deal of bad RT if itīs your first atlantic crossing and things donīt come out fluently.
Itīs the the constant use of slang by the so called īmore experiencedī pilots what annoys people and confuses controllers. Example: "Delta/United/AA 123, checking in at flight level three one oh."
Cultural sensitivity is not an Americaīs strongest point.