I don't think you identified the right reason. Sure, people may be sexist and stuff, but I believe most people here are smart enough to notice their own biases

I don't think you identified the right reason. Sure, people may be sexist and stuff, but I believe most people here are smart enough to notice their own biases if they are gently pointed at. However, what probably adds the majority of fuel to the fire is a total lack of discussion around current situation, if the measures that are taken (e.g quotas) are adequate and what are the criteria of their termination (quotas without termination criteria are just discrimination, not an instrument to solve the chicken-and-egg problem of power imbalance). People having to try and have that discussion are actively shut down and while it is effective in short term, in the long term that strategy just breeds more resentment. The message of equal opportunity gets substituted by "50% or it's sexist", and that's what people hear and that's why people upvote the post.