Current events: Why do so many Americans raise a fuss about Mexicans wanting to live in the USA?

i genuinely wouldnt mind them here if they just came in legally. Yes they do take all the jobs we ***** about having, so having them here is just convenient. I think people are angry because they've met a connivence store clerk or some one who didn't speak english and it got them pissed, so now they hate all mexicans. We are a very judgmental country, like it or not.