Ex Blackpiller here to give a perspectibe
Let me tell a brief history about my experience with this. I git into redpill a few years ago, tried out that stuff and when it didn't work I went blackpill. Stayed in the loop for 6 months and them got myself out of it. Here's what I honestly believe about stuff after seeing everything closely.
The biggest problem with the blackpill is that most if it is actually true. We can't deny the fact that we are wired evolutionary to act a certain way. There are genetic and social factors that predetermined somethings about you that can give you a massive advantage or disadvantage. However, the problem is the way most blackpillers react after this information.
The problem is that when you start blaming women for acting the way they are evolutionary wired to do, and then believing that you are entitled to some woman. The way you are supposed to react to this information, is to accept whatever there is, looksmaxx yourself and work on yourself, improve yourself and reach your potential, but for the sake of becoming the best version of yourself, not to attract women. Rather than having a sense of entitlement towards women, one should have a more inwards looking approach and focus of yourself. The problem after this is that there are so many lonely men out there, desperate for love, sex or affection and the blackpill gives them an explanation for the state that they are in. The venting echo Chambers that are made as a result of this, then sometimes turn into women hating echo Chambers.
EDIT: The point of this post is to talk about the importance of working on yourself for yourself, not for external validation and how important it is to be comfortable with yourself. The validity of the blackpill is not the point of this post and I have mentioned that I no longer believe in it completely.