'US whites'? 

The IRR's survey - not their opinion, as you suggest - was a survey of ALL members of the population so it's a factual basis for determining the population's attitudes to and experience of race relations, unless you argue their methodology, etc was problematic. From Mbeki on the ANC has used race, often irrelevantly, as an accusation, to intimidate or close debate, eg. Zuma's opinion the recent march showed '[white] racism' was alive. Where have you been for 20 years?

Would DM post an article of your or my perceptions - what  Nt’sekhe called 'implicit racism' - of racism against us? No. But given who she is, she had the gift of a valuable platform she didn't use to good effect, and instead stuck to the jaded and not wholly true 'resurgent racist' (to quote Zuma) ANC script the DA lately is so willing to use. Disappointing. Should we talk about racism? Sure. But while we do that there's a panoply of REAL problems we're ignoring. Good luck with that.