horizon flyer:
The question do we expect the USA to change ? Don't expect so they have a very poor concept of what they call Aliens. Their cabin crew and airports are terrible when dealing with international travellers, I know of people who travel the opposite way round the world to avoid passing through a US airport, so don't expect ATC to change they just don't get what the problem is.
That sounds almost vindictive and all, except the part about ATC, is irrelevant to this thread. As to ATC, most of the staff at the Southern California TRACON are professionals who use standard ICAO phraseology. Had the majority of them made this mistake, once it became apparent, they would have said, "EVA 15, make an immediate left turn to heading one-eight-zero," or whatever heading was felt appropriate. "Southbound" would not have been used by the vast majority of them.