Over the top racism?

I'm not unaware that racism still exists. I went to high school in a town that had a lot of bigotry, which was quite a learning experience after coming from an orchard community that was pretty mixed White/Hispanic and everything was fine.

This movie is based off true events and I'll concede that the central characters probably had to overcome more than an underfunded CC program, but this trailer makes it look like McFarland is Alabama circa 1960. White runners literally locking arms to give the Mexican kid a barrier to break through? Maybe that's how it was and I'm just to naive to know, but putting USA as the modifying location makes it seem like of your Mexican and you want to succeed in America, be prepared for all the white people to try and stop you (save for one outstanding individual, and his steadfast wife, who will find an opportunity for you that your traditional small-minded family was incapable of recognizing (white saviour, anyone?)). Basically the message here is that whites will try and keep you down, but if you're willing to trust "the good ones" whites will provide a path for you. How is that not condescending to whites and immigrants?