Tech is only the thing that all of these incidents have in common if you include only tech companies in your survey.
Obviously, a site like hacker news will be reporting stories about tech companies far more often than other kinds of businesses.
As unfortunate as it is, businesses produce a lot of technology and hire most of the people working in tech on a daily basis. Even if I don't like it, those businesses are a part of the field I'm in and what they do affects me, esp. if they are contributing to alienating women who already have a hard time breaking into or working in tech.
It would be interesting to see the breakdown of HN readership. I always assumed a large portion are YC companies and other startups who would be able to relate to these kinds of posts.