Sorry, but try being Romani (colloquially: gypsy) anywhere in the UK and tell me it is "white" that makes the difference.
Most people couldn't care less what their race is, but it sure is an easy card to play.
But as generations of "white" Americans have learned, if you dress from the JC Penney or Sears catalogue, forbid your children from learning their ancestral language, and forget your cultural traditions, you can be white too! It works!
https://www.google.com.au/search?q=irish+need+not+apply&sour...
here's where the "myth myth" started and was easily debunked by a high school student
http://www.irishcentral.com/roots/history/High-school-studen...