"Wab" is not a term specifically from the OC. My family is from LAC and
SFC and growing up, I heard the term in both area's, long before going
to the OC.
Regardless, while growing up, my parents made sure that I was well read,
kept up with my education, etc. I found that the most derogatory terms
would come from my own people.
Just by opening my mouth and speaking without a "Mexican" accent, I would get other Mexican guys looking at me and asking "You think you're better than us?" and my look would be of confusion, and would lead me to asking why they would think this. There response would be "Because you talk like a white boy." My response would often leave them without anything to say, as it would usually be "What does a Mexican sound like? With an accent? In that case you don't talk like a "Mexican" either. Why do you "talk Black"? These were usually guys who'd been raised in Compton.
To be honest, I never thought that there was a specific way that Mexicans should act, talk, or carry themselves in general. I've never treated anyone, Mexican or otherwise, with nothing less than respect unless I was disrespected first. I've always felt that you talk and act like you do, depending on where you raised and who you hang out with. It's inevitable that you pick up the slang and mannerisms at a young impressionable age.
The areas I grew up in had a White majority, with about 5% "other" including Latinos from many different backgrounds.
Thinking back, even the Mexican girls in High School would give me the "talk". Usually going along the lines of "No wonder the white girls like you. You're cute, but you talk just like them, so I couldn't date you."
Which funny enough, my girl for the last 5 years has been a Mexican girl... though, just like me, talks without a "Mexican" accent, but is very active in Civil rights of all people, and every ethno-centric.
Hell, I've even experienced this "anti-pocho" sentiment in Hollywood. I've done a few films, and when auditioning for "Mexican" roles, the casting directors (some were Mexican as well) would always tell me "You don't look Mexican." to which I would ask "What does a Mexican look like? You're Mexican and we have the same features." and both White and Mexican casting directors would usually deflect to "Oh well, we have a role you do fit. One is Eastern Block European, and the other is Mediterranean/Iberian." For some reason, I was always cast as some sort of European, and never a Latino of any form.
I remember telling my dad about this, and he concluded with laughing and stating the following "Hollywood has a long line of keeping stereotypes alive. They don't seem to want the world to know that Mexican is a nationality. Not a race. Mexico is as diverse as the United States because we went through as much as they did with invasions, migrant workers from Europe, Jewish and Armenian transplants. Asians in port cities, as well as Blacks on the East Coast due to slave ships coming through our ports, and even some wrecking there, leaving the slaves behind. They want the world to think that all Mexicans are short, dark, native looking people and when they 'don't' want a Mexican that looks that way, they usually hire a Spaniard, or Latino from another country... that is if they don't hire an Anglo actor to play Mexican."