The problem here is that the cases that I'm referring to are people saying that they're feminist without believing in or following core tenets of feminism. If I said, for instance, that I was a Christian, and that I believed in sacrificing animals in the temple for receiving forgiveness from sins, you would quite rightly say that I was not a Christian at all, because I didn't believe in or follow one of the primary tenets of Christianity (e.g., that Jesus dies for our sins, and that he fulfilled the law such that animal sacrifice was no longer necessary; I am not, for the record, Christian, nor do I believe in the idea of sin). Most feminists would argue that the primary tenet of feminism is tearing down gendered power structures; reinforcing gender stereotypes would therefore be not feminist.