Batista is not being downvoted because they're expressing a differing opinion. They're being downvoted because they're not taking the time to fully consider the issues and engage in reasonable debate.
As an example, from their first post, they suggest that it's not legitimate to worry about this sort of problem because larger problems exist. This form of argument is not only blindly hypocritical (that is, if the arguer believed it, they would not be engaging in the subdebate but rather be working to resolve the larger problem) but intrinsically ridiculous -- it supposes that it's not legitimate to discuss any issue while "worse" problems persist. It's a self-defeating argument on a specialized forum like HN, and utilizing it indicates that someone isn't actually arguing the topic at hand (in a sense, it's a "universal" argument, and thus like nonfalsifiable theories, completely irrelevant).
They then literally compare their own downvoting to the Salem witch trials (the irony of which is beyond belief, and further calls into question their sincerity), and additionally claim that proportion of women in tech is "not a serious issue in its manifestation or it's consequences at all", and when pressed that many people disagree, compare people who care about workplace sexism to hypochondriacs in order to marginalize their beliefs (this is particularly poisonous and a clear indicator that they're not interested in the viewpoints of others). They also fall into a really standard "I'm just expressing my opinion" backtrack, which is particularly ironic given that their initial complaint was that people were expressing their opinion on this topic rather than doing something more worthwhile.
Regardless of their viewpoint, they're not participating in reasonable intellectual discourse. We're not obligated to argue with someone who's plainly not interested in having an actual argument, and the up/down-voting is working as it should in this instance (I'm certainly not saying it works as it should in all instances, but this is pretty clear).