Assertive vs. Passive-aggressive behavior
From the Mayo Clinic:
Includes an overview of why being assertive can help you control stress and anger and improve coping skills. Being assertive is a core communication skill. Because assertiveness is based on mutual respect, it is an effective and diplomatic communication style. It also demonstrates that you're aware of others' rights and are willing to work on resolving conflicts.
Assertive communication is direct and respectful. It is not just what you say — your message — but also how you say it that is important. Being assertive gives you the best chance of successfully delivering your message. If you communicate in a way that's too passive or too aggressive, your message may get lost because people are too busy reacting to your delivery.
Assertive vs. passive-aggressive behavior
If you communicate in a passive-aggressive manner, you may show your anger and feelings through your actions or negative attitude rather than confront an issue directly. You may have developed a passive-aggressive style because you're uncomfortable being direct about your needs and feelings.
What are the drawbacks of a passive-aggressive communication style? Over time, passive-aggressive behavior damages relationships and weakens mutual respect.
Being assertive is usually viewed as a healthier communication style. Assertiveness offers many benefits. It helps you keep people from taking advantage of you. It can also help you from acting like a bully to others.