[gowld]

That's still a fallacy, even if the mechanism behind is successful on average. Assuming a bank teller is non-feminist is rational only if the feminism matters, which it does not. Even if 0 bank tellers are feminist, it's still unhelpful (and harmful is even 1 bank teller is feminist) to assume that an unknown teller is feminist for the purpose of the question. Prejudices are often statistically more correct than incorrect (though socially problematic), but in some cases are still flat-out inorrect, as they are in this example. Too to much of a "good" thing is toxic.