Since I have legal papers to enter USA, plus I have over 90% level of english... all this actually doesn't bother me.
The only thing I hate is that mexico-americans (you know, those that live in the border and aren't either mexicans or americans) always screw you, just because they want to. Even if you always have your papers at date.
Oh well, while the Mexico-USA "berlin-wall" isn't built, I really could care less about immigrants.