Doesn’t it mean more than that? I don’t think this would be the right blog to answer this question.
Actually, that’s incorrect!
Yin is actually not supposed to mean “bad”.
In Chinese philosophy, the black is to symbol such things that are feminine or negative in the same sense of “darkness”, or wetness. But darkness is not necessarily bad in the sense of being “evil”. It is more a force that exists to balance out the light. But it also includes things like “soft” or “slow” and “passive.” which are actually positive things in the right amount.
The whole idea of Yin and Yang is to enforce that idea that they are not mutually exclusive: They are two parts of a whole.
Similarly, Yang does not always mean good although we tend to connect “light” or ”warmth” as overtly positive things. Yang also “hardness” and “aggressiveness”. The concept is that too much of the one thing is imbalance, which becomes something bad.
TL:DR Yin is not always bad, and Yang is not always good: White has some points that can be negative if not balanced by Black.