Never.Yeah, but...like, when's he going to learn? lol. When's the age when white people are old enough to learn not to be racist by being punished for being racist?
If you're a child or in school up even through college: "They're just kids! Didn't everyone say extremely racist shit during their youth?!"
Out of college working adults: "He gave an apology! Besides, he only tried to kill that presumed racist years ago; he never actually went through with it! Should we just close off all paths of forgiveness like monsters? Can we never allow people to change? Besides, the world is changing; people are just scared and anxious! They're being duped by Trump! They don't know any better!"
Senior citizens: "Just brush it off! They're old and grew up in a time where it was normal! Old habits die hard!"
There is never actually a good time for white people to deal with even the prospect of consequences for flagrant racism in their lives. Because the moment you start trying to deal with a few, the dominoes might start falling, and "good people" might have to confront the reality that they're not so good after all. The indictment on a random Internet racist is an indictment by proxy on many liberals' friends and families, and even themselves. Can't have that, now can we?