American Muslims lack cultural sensitivity, awareness and respect for non-Muslims. It is a common scene in Muslim mosques. A non-Muslim walks in and is treated so badly, he or she makes quick judgments that are passed along to friends, who have never met or attended Muslim functions.
The above video exposes a tad of the problem. Throughout America, Muslim immigrants are of the opinion that they don't have to explain anything about Islam to their friends. Many Muslim immigrants begin to talk in their native languages around non-Muslim guests. It is rude behavior and very damaging in an effort to create a better understanding of Islam.