We have Donald Sterling......a man in his 80s.
And we also have Elliot Rodger the young man who shot up a southern California college town a few weeks ago because of his frustrated sex life .........a man who was in his early 20s.

Though vastly different in age, what did these two men have in common with eachother that much of the press has overlooked either by accident or on purpose?

I give. What? Donald Sterling was being serviced regularly by a mistress, and has been accused of infidelity by his wife on numerous occasions.  The old lecher is a playa. Elliot Rogers was a young hater who couldn't score with girls. 

The thing I've noticed that they BOTH have in common was that they were not only racist but absolutely hated seeing Black men with White women.

Donal Sterling obvsiouly found women of color attractive, yet he told his mistress not to associate with Black men in public.

Elliot was half Asian himself, yet considered himself to be White and mentioned a number of times of being angry and jealous of Black boys/men in his posts...especially when he saw them with White women.

Nearly 60 years of difference in their ages, but similar mentalities as far as the hatred of interracial dating/mating.

Where might that have come from?

I think your conclusion is a stretch, especially since Donald Sterling's girlfriend was not white. As for Eliot, he was jealous of any male who was a babe magnet.