If you encounter it in the workplace, you don't stand for it. It's as simple as that. It doesn't matter if you're a man or woman, whether you're dealing with a peer/subordinate/superior, if you feel your opinions and ideas aren't getting acknowledged then you figure out why and then confront the person about it once you're sure you have a decent understanding of the situation.
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It's up to the individuals involved to identify and target this bias, and form an ideal solution that's relevant to their environment and development standard.
This is a great post that i think deserves some recognition, because it actually proposes an idea of how to fight back.
It should not be tolerated, or acceptable to think that nothing can be done.
Assuming that is the status quo, and hoping that our "future" will be better because society will learn and eventually evolve does nothing for the women working within the industry now. It also doesn't excuse it, because the standard office outside of the games industry typically have very strict zero tolerance policies surrounding this very subject. harassment will still exist, but standardized protection via civil rights should, too.
At this point we need context because it is extremely unacceptable and presents a genuine civil rights case if it is universally accepted from garage developers to Valve.
Are there no success stories of women in the industry? If so, who are they and why? Why not start championing them, and the companies they point to?
In any case, Civil rights laws exist, and are taken extremely seriously in the court of the law, regardless of them not having HR. That is not how it works. That is why it is incredibly important to document every instance. They are not invincible.