Comment by matus-pikuliak

To be honest, I am not sure where this bias comes from. It might be in the Web data, but it might also be overcorrection of the alignment tuning. They LLM providers are worried that their models will generate sexist or racists remarks so they tune it to be really sensitive towards marginalized groups. This might also explain what we see. Previous generations of LMs (BERT and friends) were mostly pro-male and they were purely Web-based.