What is filtering?

"you can also be overwhelmed by your emotions when you only pay attention to part of what’s really happening. This type of thinking is called filtering"
"Imagine living your life with dark sunglasses on all the time so that it’s impossible to see the colors of the world.
it’s necessary to examine the evidence that supports both sides of an emotion-stimulating event: Evidence supporting your self-criticisms versus evidence that you’re a good person Evidence that only bad things happen to you versus evidence that good things happen too Evidence that no one cares about you versus evidence that people do care about you Evidence that you never do anything right versus
evidence of your past successes Evidence that the current situation is awful versus evidence that it’s not as bad as you think In general, evidence bad versus evidence for the good
evidence for the bad versus evidence for the good"

McKay, Matthew; Wood, Jeffrey; Brantley, Jeffrey (2007-07-01). The Dialectical Behavior Therapy Skills Workbook: Practical DBT Exercises for Learning Mindfulness, Interpersonal Effectiveness, Emotion Regulation, and Distress Tolerance (Kindle Locations 2490-2491). New Harbinger Publications. Kindle Edition.