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When you feel that another person is being rude or disrespectful, speak up about it. For example, if a person is continuously making rude jokes, let him know how you are feeling. He might not realize how hurtful or aggressive he seems and how his comments are affecting you. "I" statements convey that you are willing to take responsibility for your own thoughts and behaviors. This puts the focus on you and your feelings, so that the other person doesn't feel like you're attacking them. Nonviolent communication can be a useful technique. Not an "I" statement: "You are very rude and you are trying to purposefully hurt me!" "I" statement: "I feel hurt when you say things like that." Not an "I" statement: "You are a terrible person who is too immature to see that your friends never see you anymore!" "I" statement: "I'm feeling sad because I feel like we don't hang out much anymore, and I would like to see you more often." Attacking the other person is will most likely not be very productive. Rather, keep your calm and explain that you are trying to have a dialogue. You want to communicate how you feel instead of fighting with the other person. When you communicate assertively, pay attention to how you hold your body. Keep your voice calm and your volume neutral. Maintain eye contact. Relax your face and body position. Most people will respond constructively to "I" statements and peaceful, non-aggressive discussion. Some people may get upset, so if the conversation is going nowhere, it's time to walk away. You may choose to try again later, or simply distance yourself from that person. They may use emotionally abusive tactics, such as humiliating you, blaming you for everything, or invalidating your feelings. You may feel scared, exhausted, uncomfortable, threatened, or bad about yourself when you are around this person. If this is the case, the person is highly toxic and you should limit contact with them as much as you can. Imagine that someone else were being treated the same way that you're being treated. How would you feel about them going through that? What might you say to that person? Apply that same compassion and care to yourself. If you are uncertain about the situation, or if you have a condition (e.g. autism) that affects your social judgment, ask for advice. Confide in someone you trust, and research abuse on the internet.
Speak up. Use "I" statements. Approach the discussion calmly. Use appropriate body language. Recognize when you aren't getting anywhere. Be aware that some people are abusive.