It would blow away some of these people's minds that the "white people" that they talk about (the Anglo-Saxon/North European types), were mostly just barbaric uncivilized savages, when people from the South brought civilized ideas into their midst. And this was done not necessarily "peacefully", but rather by forced conversions and centuries-long invasions into the North (as well as invasions into the South by these barbarians, obviously). Most North Euros weren't yet even Christians, by the turn of the first millenia. For perspective's sake, Lithuania was converted to Christianity only about a hundred years before Columbus sailed to America.
What has come to be regarded as "white constructs", are mostly just constructs that were passed down in civilized societies, from Babylon, Egypt, ancient India, Greece, Rome, etc. to wherever we are at now, which have developed throughout the ages.
For anybody complaining about being subjected to "whiteness", likewise, white people could complain about the "Semitic" or "North African" origins of the constructs that they are subject under, which are the sort of accusations you'll probably only find on StormFront, not by anybody that's taken seriously at a professional level. After all, the peoples in North Africa and Mesopotamia had their shit together a long time before any North European did.
The rule of Brits and "white Americans", while certainly significant, only constitutes to a very small period of time, in the bigger picture. These so-called "white" guys didn't get the ball rolling, they just took the ball and ran with it, after they were beaten over the head with it. Anybody in their right mind will do the same.