It is and it isn't and yes everyone for the MOST part stick with they own at least where I am, which is why this whole black and brown coalition stuff is still a conundrum to me.
The only thing about DFW is that Mexicans try to force their way into Black people spaces and force in their trash culture into Black people spaces as well.
You have to go North of US 380 or the area around the Sam Rayburn/Dallas Tollway to have minimal interaction with Mexicans.