My assumption is that they don't really believe in anything. They just like having an excuse to bully others. If you believe that the world is going to be shit regardless of what anyone does forever, you don't really have any incentives to do good. You just have incentives to revel in the chaos and destruction.

Also, plenty of women hate other women more than they hate men. They think finding the right man is their ticket out of patriarchy. Hilariously, despite being the worlds biggest pick me, Pearl is still single.