Why is it ok for blacks to favor blacks ?

B/c it's OK for black people to be racist. B/c their racism isn't racist. :). I hope that makes it clear as mud. 

As in the past people can favor whoever, why because nobody cares.

Because liberal identity politics have become PC.  

Give us an example?

Are you talking about elections?

Whites routinely favor whites.  It was found that Obama lost more votes for being black than he gained for being black.  Don't worry, it still makes a difference to lots of whites.

We have an entire system of politics and police that favors white people. Black people are currently protesting to try to change that, because it's Bullsh*t, and just like with MLK, all the conservatives can do is label them 'domestic terrorists' as they cheer the American Gestapo tear gassing citizens exercising their right to protest.

Maybe we should just not favor anybody, based on how much f*cking melanin is in their skin. It's an idiotic system to go by.

But, it’s ok for whites to favor whites.