I live in Korea and married to a Korean so tons of stuff:
the fact that my FIL does nothing in the house and doesn't even thank my MIL for anything. He finishes dinner, stands up and walks away. Totally normal here but I find it hard.
Attitudes to sex: my husband was shocked to his core that I had condoms in my bedroom. Women are not meant to be 'prepared' for sex. (And he is quite open minded - he didn't think anything bad, he just never thought a woman would buy condoms.)
EVERYTHING to do with work - working til 11 for no thanks, 10 days holiday a year, being forced to get pissed with your boss, being told not to lift heavy stuff because you're a woman, having no say in anything because your boss decides everything.
People commenting on your appearance- and very rarely positively. My MIL had kittens when I went out without make up on.
People spitting in the street. I remember looking at this lovely looking guy, nice suit, handsome, and he just hawked up a massive blob of snot and spit it on the pavement. People do it a lot and I find it horrible.
Also how horrible a lot of white expats are, especially men. The way they look down on Korean people as if they are so dumb and worthless - but obviously they are desperate for a Korean girlfriend. Quite pathetic.