It seems unfair he was named but it's probably not true to say private education holds you back in music. Quite a lot of performers went to a private school. For example here is the Alumni for just one such school:
http://en.wikipedia.org/wiki/Categor...f_Theatre_Arts (although that list seems to favor actors). This isn't a new issue either, it was noted a few years ago:
http://news.bbc.co.uk/today/hi/today...00/9373158.stm
I believe privately educated students make up 7% of the student base and are disproportionately represented in the arts and some sports. I don't think we need to 'bring down' those who've achieved that success after coming from a private school but ask why there is such an imbalance. Part of it is probably just a fact of life, parents who are investing that much in their children's education are probably more involved and may well have more income to help them achieve outside of school as well (such as music lessons and instruments).
However another part might be that arts lessons are much better at private schools and other children don't have the same opportunities. If that's the case then it's right to look into it. We shouldn't halt the progress of those from private school or resent their success but we should be trying to ensure equality of opportunity as best we can.