  Research has focused on automated methods to effectively detect sexism
online. Although overt sexism seems easy to spot, its subtle forms and manifold
expressions are not. In this paper, we outline the different dimensions of
sexism by grounding them in their implementation in psychological scales. From
the scales, we derive a codebook for sexism in social media, which we use to
annotate existing and novel datasets, surfacing their limitations in breadth
and validity with respect to the construct of sexism. Next, we leverage the
annotated datasets to generate adversarial examples, and test the reliability
of sexism detection methods. Results indicate that current machine learning
models pick up on a very narrow set of linguistic markers of sexism and do not
generalize well to out-of-domain examples. Yet, including diverse data and
adversarial examples at training time results in models that generalize better
and that are more robust to artifacts of data collection. By providing a
scale-based codebook and insights regarding the shortcomings of the
state-of-the-art, we hope to contribute to the development of better and
broader models for sexism detection, including reflections on theory-driven
approaches to data collection.

Computers and Society;Computation and Language;Social and Information Networks