Just because you think you're right doesn't mean that you are. Everyone has an opinion. You don't need to be the loudest and most obnoxious person just to get your voice heard. The squeaky wheel may get the oil, but it may also get replaced.
You might feel better for a little while if you prove your point. But you will likely cultivate an enemy or at least some animosity between you and the person you just caused to feel inferior.
Never interrupt someone when they are speaking. Unless someone is on fire, about to fall off a cliff, or drowning, let whoever is talking finish their thought. When you interrupt someone you are subconsciously telling them that their voice is not as important as yours, therefore they feel as though they aren't worthy. It's a horrible feeling.