Just because the problem is not specific to the tech industry doesn't mean we shouldn't be trying to solve it. If women feel uncomfortable working or contributing to the industry because of their gender then we are missing out on possible contributions from a massive section of the population.
Will cases of sexism always exist? Probably, their will always be a bad apple or two. But we need to work to make these these cases the exception to how the industry works. We need people to feel safe contributing regardless of who they are. If you have something to contribute you should be able to, that is one of the things I personally love about this industry. Just because we can never fully solve a problem doesn't mean we shouldn't try to minimize it.