Feminist killjoys need love, too. Luckily, there's Etsy. I'm not sure what possessed me to type in "feminist killjoy" in the Etsy search box—which, really, is one of the most wide open, possibility-laden places in the universe—but I did. And oh, am I happy I did.
You can be the sparkly, shiny feminist killjoy (WickedQueer, $36):
You can be the feminist killjoy that hangs in the back of a wedding (UnicornParadeShop, $36):
You can be a feminist killjoy that goes seamlessly with any outfit (ThePaperPoppyStore, $24):
You can be a feminist killjoy, handpained with love (fitforfoxes, $4):
You can be the feminist killjoy everyone warned you about (rahrahreplica, $2):
You can be the feminist killjoy who knows her way around the library stacks (ModernGirlBlitz, $15):