Thanks Rose I am so glad you agree.
Thinking about it some more- I do wonder to some extent the 'way of life and integration' makes a difference in perception. The young woman spoke native English and didn't wear any kind of 'ethnic' clothing that would have perhaps set her apart in some way.
For instance, if an English family lives in Spain- children are born in Spain, but they only speak English at home and never learn Spanish well, go to the local Anglican Church, never eat local foods, and spend all their time with other expats (ooops, immigrants) and do not mix with the community at all, send the kids to English schools - then their perception as Spanish would be more tenuous.
Whereas, if the family all speak Spanish fluently, despite perhaps choosing to speak English in the home and with close English friends, go to the local school and join in local activities, etc, happily eat most Spanish foods (but of course still have some English stuff at home and from time to time, including Turkey and trifle at Christmas, etc)- then the perception would perhaps be very different.
Now, it would not change the facts- but change the perception. It is actually very possible to keep one's language and religion, and at the same time be totally and well integrated- as the young journalist obviously was. The young man from LibertyGB told her, again and again, that whatever she achieved, whatever her behaviour and attitude, whatever her integration, she couldn't ever be considered 'English' - it was totally clear. And totally wrong.