Ask yourself if the behavior is out of the ordinary for the student or if the student demonstrates such behavior regularly. If you find the student's disruption out of character, rein in the situation quickly with a gentle but firm warning. If the student repeats the poor behavior on an ongoing basis, be ready to respond with a firm but simple phrase such as, "I treat you with respect, and I expect the same respect from you."
Respond quickly, calmly and firmly. Do not allow the student to undermine your authority. The longer you tolerate his rude behavior, the more difficult it will be to maintain or regain control of the situation.
Enforce classroom rules that you established at the beginning of the school term. Set forth a class plan and code of conduct, and have the students read and sign the code. Such a contract will give you a reference point and a document that you can calmly and assuredly use to remind all of your students that rudeness is unacceptable.
Remain calm and objective. Taking the student's rudeness personally will encourage you to respond emotionally when you need to be calm and in control. Sometimes the student's intent will be to ruffle your feathers, so giving in will only encourage the poor behavior or escalate it.
Model the behavior you want from your students. Be consistently calm and polite. Being human, teachers have tough days, too, and it is important to check your own problems at the door. Treating students with respect each day will help reinforce good behavior, according to the National Education Association.
Report ongoing rude behavior to the administrative offices and allow them to deal with the student if you have run out of your own methods. Sometimes a more stern intervention will be needed if the student's issues are more deeply rooted or if she remains resistant to your authority.