These apply to a previous ex, many years ago, but he was soooooo annoying it feels like yesterday.
Pretending that presents weren't important, so no, he couldn't think of anything he needed. But OMG, the little boy sad face when he didn't like what I or anybody else had bought him. Our last Christmas I bought him a really expensive wallet. He opened it, did a little pained smile, and put it down. A while later I just exploded, and asked what was wrong with it. Apparently the notes didn't fit in as snug as with his current (falling apart) wallet.
Having his brother to stay, who lived a pretend, eco-friendly, save the planet type life in an old factory. He constantly moaned about any signs of conspicuous consumption (like doors, sofas, walls, you know the stuff...) but didn't mind eating and drinking us out of home with our non-ethical shopping. Never lifted a finger and said we had too many sofas !
Having to go to the same local pub near to his mum's every Christmas Eve. Same bunch of ageing alcoholics as the year before, the owner so pissed he could barely stand, then having to pretend to be excited that we were having a lock in.
The first Christmas without him was bliss.