Yikes! I don't know whether to be more disturbed by the offending posts, or the fact that you managed to collect them all! Good work.
We can click on a link that gives us all of the recent posts of a user. When you read the last 20 posts he has made and find all of those in there, it isn't that hard.
There is an outside chance that this one was posting like that all along and no one noticed (he was a real low volume poster until recently), but I think he turned on a dime. Became more prolific and suddenly a bigot.