If you look down on people and treat them badly, they'll retaliate and appear just as annoying and hostile as you expected.
So far, the US has imposed tariffs on Chinese steel and aluminum products, leading the Chinese to retaliate with matching tariff rate increases on $3 billion in US exports in the spring.
Don't let them argue with you, either—if they're truly manipulative, you need to end the relationship and move on without letting them retaliate.
Don't get even: No matter what your partner has done or however they've wronged you in the past, don't retaliate or act in bad faith.
And many western companies are in effect stuck: they can build defences against cyber crime but cannot effectively retaliate.