Yes, I do believe there is an objective reality "out there." But you can't deny that each of lives in our own mental universe, made up of our understandings of people and things. As the Hebrew scriptures tell us, "As one thinks, so one is."
If we will choose more positive language to describe people and situations, we will think, feel, and act more positively, especially in dealing with challenges. I'll confess I often forget to do this, but when I do speak and think more positively, it does change my feelings toward a person or situation. Even using the word "challenge" instead of "problem." Advertisers and governments daily demonstrate that they do not underestimate the power of words to shape people's actions.
Along these lines, here's a fascinating
article,