Simon:
- No, it's not 1-1 because things like immigration create self selection issues. For instance, if a country has a rough or lengthy immigration process, it will self select for the type of people willing to go through that process, who are then raising their children with the mentality that brought them to that country in the first place. However, if there was an indigenous population that was conquered and perhaps lived below poverty, that self selection process will not be in effect for them, since the group will be more randomized. That's just one example of how that process can be skewed.
(Also, there is a point in which the percentage of the population someone belongs to is so small that their uniqueness will work to their advantage)
- Again, as stated, anyone can go browse users in your area on a site like Match, scroll down to their racial preferences, and see for yourself without having to sign up or log in (unless they changed that recently). It's a way to show one singular instance of an undeniable handicap that certain peoples have, and others do not, without having to go find long papers that no one will read. You can look at it, pretending you're a Middle Eastern man, for instance, and then see how woman after woman excludes you from their preference, and then imagine how that would affect your dating outlook in general from there as you meet people in public (wondering if the percentages are the same).
Whether you wish to make up your own definition of a defined term because you don't like the word usage or whatever or not, the sociological concept of privilege means that someone has an unearned advantage in an area just due to the nature of unchangable and unchosen things about themselves. On a dating site, people defined as white/caucasian have an advantage in the U.S. as a whole because 5 or less percent of women and less than 1 percent of men purposely exclude them from their searches and pools, as compared to anywhere from ~80% or less for other races. This is a strict numerical advantage that cannot be denied, can be publically searched, and is simply a noted example of an advantage. It's a case in point to where anyone here can put themselves in the shoes of another person.
Similarly, a privilege straight people have over gay people is to be able to "assume" that whoever they meet of the opposite sex, anywhere, is straight as well, without having to consider that they are gay. This is a ridiculously huge advantage that straight people enjoy. Nobody "blames" straight people for this, again, it's just an advantage. That's simply the concept, something that so many people even try to deny exists in the first place (but then are QUICK to claim it in other areas, for instance atheists talking about Christian privilege in the country).