I have seen this type of thing, too. White kids generally avoid blacks when they have a chance, but Hispanic kids are much more likely to stand their ground and to even try to provoke a response.
Anyone who thinks public schools are socially integrated needs to visit one during lunchtime. In cafeterias, things are very tribal. Whites with whites, blacks with blacks, Hispanics with Hispanics.
There are variations, of course. Hispanics and Asians will hang with whites if there aren't enough of them in a smaller school to have their own group.
The only place I've seen real integration is with sports teams, and that lasts only for the duration of the practice or game. Afterwards, they go their separate ways.
Having said that, interracial dating was quite a local trend recently, but appears to be dying out. Not saying it's right, but it is what happens... white girls pay an enormous social cost after having dated a black boy. I've learned through conversations with former students that a "boycott" or shunning of these girls can follow them for a very long time.
That really depends where you grow up and that’s not the case everywhere and I did not even see that when I went to school in fact most of my friends were mostly non-black/mixed for they were like me culture wise, and as person who has been around I never even heard of any of my dates suffering because they dated me and even met the family on occasion, again no issue, maybe you live in an different area, dunno, but its not the case everywhere.
And yes, I have also heard that once a white girl dates a black guy, white boys don't want much to do with her.