If you say what's true for you, and say it clearly and kindly, you get one kind of result. But if you use a sharp tongue, speak falsely, exaggerate, or leave out the parts that are most important to you, you get different results.
Perception is reality to the average human. That is deeper than it sounds. It means that every single person has their own version of "reality" or what they would call the "truth" based on their perceptions.
We can't possibly know what is going on inside someone else's head and thoughts -- even though we know someone really well. It's always better to check. And the best way to check is by asking questions.