Is claiming the U.S. is run by a patriarchy that oppresses women an example of a conspiracy theory?

Yes.   Conspiracy Theory:   “a belief that some covert but influential organization is responsible for a circumstance or event.”

Feminists claim there is a magically influential organization called the patriarchy that is responsible for oppressing women.  (Never mind that women are privileged, not oppressed)

Yes. It’s a feminist lie and conspiracy theory. 

When those claims are being made by women who are actively seeking to suppress the opinions of other women they don't happen to agree with it's less conspiracy theory and more just garden variety hypocrisy. 

"Is claiming the U.S. is run by a patriarchy that oppresses women an example of a conspiracy theory?"

Absolutely. It looks at the leaders to notice that they are male, then assumes that the male leaders will grant power to all men, just because they too are males.  This completely ignores the reality that men compete with each other for power at the top, for starters.

It then looks at the remaining power structure, as in the senate, congress and judiciary, which is currently 30% female, and ignores that to still call the entire system a "patriarchy".

The truth is that common men have no more "power" than common women do.  If we actually lived in a patriarchy then men would have some sort of legal authority or dominion over women.  This means some random guy could go up to Oprah, or a female senator and tell them to step aside so that they can take over their positions.

The entire feminist premise of "the Patriarchy" is an unfounded assertion.  It posits that all men conspire to give themselves some sort of control over women, and provides anecdotal examples with no actual proof of any kind.  That is a conspiracy theory.

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No, that's victim playing. Conspiracy theories are when you think there is complex planning involved to take advantage of you. Victim playing doesn't require you to believe in a plan.

It's just a stupid bit of rhetoric is all. If you take a look across the nation at how many women are in positions of power and authority in govt, you will clearly see that the claim is simply false. Start with the current Vpotus.

No.  All U.S. presidents were men.  Over 90% of CEOs are white men.  We don't have the Equal Rights Amendments because of Dixie states.