As it became made increasingly socially unacceptable I suppose a few woke up to the fact it was rather silly. The rest, unfortunately, just learnt to keep their own council the majority of the time.
I do believe though that it is lessening as racism is something that is learnt, and the less people that are vocal about it the less opportunity for others to 'learn'.
Racism is not confined to white people. Everywhere I've been in the world I've witnessed racism, in some places more than others.