You do bring up a very interesting point: examples of racism are just as likely to be dismissed as isolated incidents rather than symptoms of a more widespread phenomenon. Racial minorities in tech experience a lot of the same issues as women do, and the same frustration with the dominant paradigm refusing to acknowledge that it's actually real.
I'm pretty fortunate--my current workplace (I'm a woman in IT, obv) is as you describe, men and women working together in a pretty egalitarian environment. But even I'm not so naive as to think that my experience invalidates all of the other examples of sexism in the industry. For one thing, the happy scenario you describe hasn't always been my experience. It isn't the experience of many other women in the industry. And you don't have to visit any linkbait websites to see evidence of this, either. Try attending a tech conference like this one and just talk to the women in attendance about their experiences. Better yet, listen.