Mr. Grinch

These are negative people. Nothing is ever good enough for them.

In the church. I call these people graveyard Christians. They have lost the joy of the Lord and are just biding their time until death.
You may have some of these people in your family.
Interject positivism.
Change the discussion.
If that doesn’t work, carry a survival kit.
It can contain things you like to do such as a hobby, a book or pictures to look through.

When the Grinch starts their downward spiral, simply go sit somewhere else and occupy your mind with something that won’t pull you down.

Misery loves company; but, if you don’t give toxic people an audience, they will have to move on or be quiet. -- Travis Plumlee