What you speak does matter to others. So have a pleasant way of telling anything, instead of using harsh and rude tone. It's something like a ripe fruit tasting sweeter than the unripe one. When we speak in a pleasing manner, it adds value to both the speaker and the listener.
Your speech should make the audience feel wanting more from you. There are people that keep on talking without minding whether the other side is interested in their lecture.
So keep your talk short and sweet to appeal to others. Pleasant speech will earn friends. Even the enemies.