The people that are racist are constantly, constantly, constantly looking to make jokes and snark and other comments to like-minded people that appreciate such things. It reinforces among the community their opinions and sets in stone not only the though processes, but the social acceptance of such things into perpetuity.
Racists have race on the brain; they see everything through a racial filter. Same thing with sexists and homophobes.
They are like the boorish guy who tries to turn everything into a sex joke. "I'd like to see her download something, if you know what I mean!"
And it's all a cover-up for their own insecurities. They have to live in this bubble of being able to constantly find an oblique racists, or sexist, or homophobic comment to tweet about because they're really afraid of competing without the inherent advantage that white straight men have.
Disgusting fucker. 
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