Possibly because redpillers might think this is the "natural order of things" and that no healthy change is possible.

That would explain why some women are okay/attracted with TRP while some aren't : because the level of internalized sexism change from one woman to the other.

That would be the difference between redpillers and feminists : feminists also acknowledge that society is sexist but they blame the system (which they call "the patriarchy") and they try to change it.