Glazed porcelain such as used in toilets and plates and such is so smooth that dirt have a hard time sticking to it. It is also very hard so it will not get scratched very easily. So it is used in places that needs to be easily cleaned. Most toilets are just rinsed off after each use as you flush them and will then become completely clean again. Sometimes you might have to use a light stroke of a brush but rarely any more then this. This is because dirt have a hard time to stick to the glazed porcelain.
The reason we use white is because that makes it easy to spot if the toilet is clean or not. So naturally we associate white with cleanliness. If you have a black or even worse a brown toilet then your mind just automatically assumes the toilet is dirty as you would not see any of the filth.
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