It differs how much it influences daily interactions, citywide or regionally. In Beijing it is noticeable in a lesser degree, but often is perceived by outsiders/foreigners as 'bribing' when a small present is involved.
Edit: I do not mean anything bad. I have lived in Beijing, China for many years (married to a Chinese). Just some foreigners have more difficulty to understand this (as the reasoning why they call it the G-word). I hate to call this a 'cultural difference', as I believe it is mostly related to misunderstanding. This is all due to a different upbring, in a different environment (and receiving a different sense of what is common). This can often lead to misunderstandings as people perceive the actions in the wrong way. It might help to have a look at Cultural Dimensions [https://docs.com/gerard-braad/1061/cultural-dimensions-asia]. This explains some of the things involved. Just a translating it to 'relationship' does not mean it has the same meaning. Many words and concepts are different between cultures. TL;DR It is definitely not the negative words mentioned below. Just 'smoothing' a relationship which seems beneficial should not be seen as brown-nosing. Above; hyh1048576 explained it very well. People blame themselves if they got rejected for something... others might judge them as saying they haven't put enough 'effort' into it. When the relation seems beneficial, they will try to do something to 'smoothing' the relationship. But as mentioned, in Beijing this happens in a much lesser degree but not invisible.