So, not-English speaking people are "less nicer"?-_-[...]As you move north and west things get much nicer.[...] good schools and English speaking people.[...]Irving is little Mexico.[...]
To anyone that want to move in Dallas, I wholeheartedly recommend it. Don't worry, though, racism is not a big deal here, provided you learn how to recognize and avoid douches like that guy.
The weather is very hot during the summer, so you better be a sun-lover, but the hundreds of lakes and parks around the Metroplex will make you enjoy also the warmest part of the year. Good job opportunities and low housing cost make of Dallas a good destination to start a new life.