Some using the hashtag claimed that the song was an American song and to sing it in another language was un-American; these people used #SpeakAmerican in support of English as the only "American" language. Others supported the commercial arguing that our country was built by immigrants and as such we should celebrate our unique diversity; these people used #SpeakAmerican to argue that to speak "American" is to celebrate diversity.
Do your own Twitter research. Search #SpeakAmerican and see what people have to say about the add and decide where you stand. Do you find the commercial offensive? Are you offended by some of the reactions to the commercial?