Racism in southrn texas? against mexican people!?

ok, im white and i used to live in kansas city. I recently moved to a smaller town (about 60,000) in Texas. i was friends with ALL kinds of people, i was just so used to everyone kickin it for the most part lol. It is VERY diffrent here, i go to a public school and there are no black people.. only mexican and white. The white kids dont even talk to the mexicans! Its like 2 diffrent schools in one!! i didnt know this still went on! the white kids are very rude and racist toward the mexicans.. in kc this would never fly, they would woop that a s s.. but they dont say anything here!! is this normal or are these kids just racist bigots? its so strange to me that you can drive 7 hours from kc and be in a place like this !!