The description of a Native English speaker is usually reserved as a reference to the citizens of the following countries:
USA
UK
Ireland
Canada
South Africa
Australia
New Zealand
This classification places the citizens of other countries, but who were born and raised speaking either British or American English, and were educated in international schools where the medium of education is English, at a disadvantage. English tests would classify these people as "Native English" speakers, while those from the countries listed would argue that they are not native speakers simply based on syntax differences and accents. Which does not matter to the educator in the English speaking country since English is acknowledged as a living, breathing, and evolving language that is influenced by various usage eccentricities of differing countries, hence the constantly changing language use that helps the language to grow in international influence.
The truth is that one need not be born in the listed countries to classify as a native speaker. These qualifications that matter so much to the writers at this forum do not matter at all. As long as the person speaks/writes fluently in coherent English, regardless of whether it is American or UK English, regardless of his birthplace, he is classified as a Native English speaker because English is his native language and he uses the language in a manner almost indiscernible to that of one born in any of the enumerated countries.
The opinions are that of the author's alone based on an individual capacity. Opinions are provided "as is" and are not error-free.