I would urge you not to join Blind if you consider yourself reasonably comfortable with your perception of your coworkers. It will change.

Blind is very toxic. It's one of apps I install rarely, only when needed (something is happening at work or to gauge offers) just for mental health reasons. It's unbelievable what people are comfortable sharing under anonymity. HOWEVER, it's one of the only places in tech where the koolaid is called out for what it is and nobody pretends to be happy. It's an island of sincerity.

I am not in the tech world, but reading through HN has been more than enough to understand exactly what you mean. Ultimately, people's opinions will change depending on what increases their material conditions at the expense of other groups, and I am no different in that regard.