I live in Albuquerque, New Mexico and I saw an interesting photo essay in a local newspaper about segregation in Albuquerque that included photos of "whites only/ coloreds only" signs but even to this day New Mexico doesn't have an especially large Black population so what was the point? What did segregation look like in a place where the majority of the population is Hispanic and or Native American?
While not as specific as what you are looking, these posts may be interesting
What was life like for Hispanics/Latinos in pre-Civil Rights Act America? Did they suffer the same types of discrimination as African-Americans? written by u/Nevada_Lawyer
This comment, while in a thread dealing with the Asian American experience, nonetheless provides good insight into the general "mindset" of segregation and does talk (very briefly) about how Hispanics fit in: Where did the Asians sit on the bus during the US segregation? written by u/EdHistory101