Be patient in your response
While dealing with an awkward situation or a rude coworker, you must not be impulsive in your reaction. Take a deep breath and think about the situation for a moment before your react. You must understand that an angry or emotional response will worsen the scenario.
Understand the reason behind a rude behavior
When a co-worker behaves badly, try and understand the reason behind it. Sometimes a person is having an off day or he/she is facing a personal problem, which may lead to cranky behaviour. In such a case, you should not take that rude behavior personally and handle the situation accordingly.
Reacting strongly to a coworker’s rude behavior may hurt your overall impression at the workplace. Therefore, you must consult a close friend or trusted colleagues and know their perspective about the situation. Remember that you will be assertive in an effective manner only if you are cool and collected.
Be authoritative & confident
Some people find it easier to deal with such circumstances, having practiced what they want to say. In order to be assertive, you must be very confident at the time of response and should sound authoritative. This will have a stronger impact on the coworker who has been rude to you.