Do atheists even need an objective moral system?

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What I'm trying to illustrate is that these words don't have objective meaning. They are subjective and open to interpretation. Morality cannot be objective because what is moral is subjective.

Something is "nice" if you do something for someone else that they like and appreciate you doing for them. The resulting reaction would be something objective happening in a reality inside someones brain that you're causing through your action. Of course the action would have to be voluntary and it won't count as niceness if the action is done purely to gain something in return. So intelligent beings just have the capacity to be nice to others because they want to and can, it doesn't fall into either the supernatural or science.