(Note: this isn't a replacement for addressing bad behavior, leaving toxic situations, etc.)
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I had two roommates and one of them was often a real jerk. He was a bit older and he'd lecture us other two about our lives and on a range of issues.
Over time, I'd find that the other roommate and I would trash talk the jerk when he wasn't around.
One time the two of us were sitting in a diner late at night, complaining about the other guy, and we just decided for some reason to change the script. "Let's say what we appreciate about him."
So we did. It was difficult at first, but going back and forth we were able to identify a bunch of stuff that we liked about him. "His beard is great." "He likes good books." "He wants to see people thrive."
Then we headed back to our apartment and to our surprise we were actually looking forward to seeing him. And he seemed like he was looking forward to seeing us.
Things got easier after that. I realized that my expectations and posture toward him was part of the issue—I was getting the negativity that I was saying I was expecting. And so altering my words was a really good step toward fixing my lens and adjusting my heart.