Carefully draping wet jeans over wet t shirts, wet socks and wet dresses because 'there's not enough room' on the top two bars to put everything separate.
Pathological aversion to closing cupboard doors, stacking crockery in size order (two perilous towers of china with at least 3 mugs and a glass poked in around them waiting to fall out of the open cupboard at head level instead of 4 perfectly neat and manageable stacks).
The dishwasher. I'm not sure how it makes sense, but it looks like he stores everything in a soggy cardboard box for at least a week before tipping them into the perfectly well designed rack in a heap.
See also putting glasses and cups in the bottom rack and leaving the pots out because 'there's no room', ignoring the fact that not only would there be room if the glasses and cups were in the correct rack, I bought a dishwasher that has collapsible spokes so large pots can lie flat.
Washing up by hand. Why? A) We have a dishwasher. B) It only happens once he's run out of other things so it's all cluttering the side. C) He does it with practically cold water, doesn't scrub, doesn't rinse and then leaves it on the side to put dirty stuff on top of it because he CBA to shove it into the cupboard until he can't access a square foot of countertop.
Always walking either ten foot ahead because he's forgotten that I can't walk fast or dawdling just out of my peripheral vision so I know he's there somewhere but he'll never be visible until he cuts straight across me.
Napping. It is not a hobby. Just stay up, then turn that damn phone off instead of keeping yourself awake half the night with podcasts and radio shows and then scuttling back to bed at the first available opportunity on the grounds of being 'tired' (but won't sleep, will stay awake with eyes shut, listening to more sodding podcasts for hours). If I was ill and actually needed to go to bed straight from work, it's guaranteed that by the time I came out of the bathroom, he will have run up the stairs and hurled himself into bed first.
Mumbling. It should not be a surprise to him after all these years that I haven't been miraculously cured of deafness. Speak to my face, not the side of my head.
Lovely, lovely man, but oh, my God, he has the spatial awareness of a dairy cow in a toilet cubicle.