Of course Orwell also said:

One can assume, therefore, that many people who would perish rather than admit to antisemitic feelings are secretly prone to them.

So you pays your money, you takes your choice.

He also made this observation which I think is very true when it comes to considering any unconscious prejudice:

What vitiates nearly all that is written about antisemitism is the assumption in the writer’s mind that he himself is immune to it. ‘Since I know that antisemitism is irrational,’ he argues, ‘it follows that I do not share it.’ He thus fails to start his investigation in the one place where he could get hold of some reliable evidence – that is, in his own mind.