I have to strongly disagree. Go back 200 years in any country and it had a society that was far less tolerant. Sure there are oscillations where people are less tolerant today then they were 10 years ago, but that's how any natural system works. The trend for history has always been increased tolerance. Racism is losing, sexism is losing, homophobia is losing.
Reminds me of a thesis I heard a while back about the big outbreak of Islamist terrorism: it's because they are losing. They are becoming frantic and apocalyptic because they are losing their own culture war slowly but surely.
