What they don't say in this study is what they class as racial prejudice. Some pyschologists suggest that the majority of people have an innate racist response, which may well be 'pre-programmed' or could be a product of soceity. Ultimately though, if it's a subconscious response there's nothing you can do about it except make an effort not to act on it.
If however they mean people will act on their prejudices then it's a heck of a lot more worrying. That being said we're still far better than, say, 50/60 years ago.