I have a sneaking admiration for FIL shortly before he left MIL.
They were going on holiday together for the first time in years (she'd come up with reasons why they couldn't, such as money - he made plenty - inconvenience, that the weather would be bad, the house would probably be burgled, people would be horrible, the hotel would be dirty, etc) and he'd asked her to navigate through a particularly complicated bit.
She was so busy moaning that she didn't notice him adjust his course (as she was obviously too busy to look at the map) and she fell asleep. She woke up as they were pulling into their road. He dropped her off, drove away and spent the weekend in a nice hotel the local pub by himself.
DP has a tendency to complain at the idea of places being busy, there being horrible people (his ex's mates), the cost, the weather being too hot, etc. After plenty of 'it's not that hot, we have sunblock, I don't give a fucking shiny shit if she or her mates are there or not, I want to go with you, I have the money, etc, etc', I snapped at him that he was sucking any joy out of my life and I was tired of having to be so fucking relentlessly chirpy around him.
Turns out that when he had been very ill with depression, the one thing that got through to him was my coming home from work and incessantly wittering at him - the idea that I was losing that scared the crap out of him and he started coming along to things, looking at me grinning and splashing in puddles when it pissed down and generally being too bloody minded to focus on the negatives. My warped sense of humour got him a couple of times as well - deadpanning the most inappropriate comment possible when something was actually pretty shit disarmed him a few times when he was in danger of slipping back.
I grew up with the 'nothing will ever be good enough'/''ah, but this fantastic thing is actually crap because...' bollocks ringing in my ears. I'm not about to tolerate it in my own home.