You came to our country, YOU learn OUR language

Recently, I came across one of those facebook groups that people make. This one is called “You came to our country, you learn our language”.
Of course, one could argue that nobody really knows what country they’re talking about, or what language is being suggested here. However, it is clear that it refers to the United States and to English. For the most part, Americans are so ethnocentric that they assume everyone on facebook should know what they are talking about—and we do. Let’s not pretend like we are oblivious to what they are referring to.
Here is the point I want to make, though. I speak both Spanish and English to the point that when I am in America, nobody realizes I’m a foreigner. I’ve fooled people by pretending I’m from [blank] and they totally buy it. Works every time. I also do understand the frustration of many Americans when they are told they should learn Spanish simply because other people have migrated to their country and they fail to know their host’s official language. Up to this point, I will agree with every claim made by every person that considers immigrants should learn English. What I don’t understand is the xenophobia that is usually contained in almost every American citizen. Is learning Spanish (or any other foreign language) a bad thing? Would you not grow academically and intellectually if you were to tackle another language other than your mother tongue? Do you expect the entire world to speak your language but make no effort at learning another one? It seems to me that it is an arrogance problem. Most people in Europe learn at least two languages, even if they consider theirs to be the superior one. Most people in Latin America know at least a bit of English, and they don’t feel like they are being pushed to do it. Why the vendetta against anything that is perceived as foreign?
Some people make the claim that before America was actually Mexico and before the languages spoken were different, and before whatever...
I realize that what happened before is long gone and we have to focus on what is happening now.

Yes, immigrants should make an effort to learn English. It is only in their best interest to speak the language if they expect to get a good job and better opportunities in America.

—and—

Yes, Americans should make an effort to learn new languages so they can acquire more knowledge and grow intellectually.

Note: It is funny that on the facebook page, the creator makes several spelling and grammar mistakes. Perhaps they are right in not wanting to learn a new language if they can’t tell the difference between “hear” and “here”.