By that logic, portraying the lone black guy in your movie as a jive-talking gangbanger isn't racist, because it's not like there's any other black people around that are also negative stereotypes.
There's a difference between a negative
portrayal and a stereotypical
portrayal. Now, if the Amazons are being portrayed as getting into catfights a lot, obsessing over each others' appearance, or being overly weepy/emotional, that's a different matter.
I would be more willing to consider this argument if matriarchies weren't almost always portrayed as man-hating feminazi headquarters.
Thing is, if a society is a matriarchy, then there probably is
a fair bit of man-hating going on. A matriarchy is a society where women are the dominant gender and hold a grossly-unequal share of the power; unless outside circumstances have drastically reduced the male population, it's hard to see how that could occur except through widespread sexism.
Same thing goes for patriarchies. I dare you, I double-dog dare you
, to find a story written in the last couple decades where:
A society (real or invented) is explored in-depth.
The narrative explicitly refers to this society as a patriarchy.
The society is not depicted as being oppressive against women.
Granted, there are plenty of stories set in patriarchal societies where little or no time is spent on this aspect of the culture, but that's a result of patriarchies being far, far, far
more common. People are very familiar with what patriarchal societies are like (most folks live in them, afterall), while matriarchies are quite rare and so demand further explanation. Kind of like how, if you portray a society with a professional police force and a codified system of laws, you don't need to dwell on that fact or explain the benefits and pitfalls of the situation. However, if you portray an anarchist society with no police and no written laws, people are going to expect you to give them more info on how it functions, not because it's necessarily worse than the former, but because it's less familiar.