Hmm, I definitely understand your upset. But it just reminds me of Arizona, where they recently passed some sort of law allowing police officers to ask for I.D. from those they suspect could be illegal immigrants. I'm not saying this has anything to do with that necessarily, but with the federal government doing little to really help illegal immigration problems, states are being forced to take matters into their own hands.
Language barriers are just one way of doing that.
So while I'm not saying I like this, I can understand the possible reasoning behind it. Its not about whether or not Spanish is a beautiful, culturally rich language, or French is the language of love, and I don't think its trying to be offensive, just looking towards the interests of legal American citizens.
Of course there could always be other things I'm totally overlooking. This is just what I'm thinking after having read the article on the Arizona law.