"I think women oppressing women is understandable without there needing to be a causal link from men."
Wrong. Women oppress women in the context of living in a patriarchy, where men are seen as the default human, women are seen as the "other" and they fight for the crumbs from men's tables and fight for male approval.
"Men bully men and impose oppressive and humiliating status hierarchies on each other without the need for influence from others."
This is patriarchy. This is the "influence from others" - other men, who are buying into patriarchal values.
"Perhaps women oppressing women has more to do with an oppressive status based culture that to some extent western male culture does not feel as strongly any more."
Wrong again, I think. The oppressive status based culture is patriarchy and though it may not be expresses as explicitly as before, it's absolutely amazing to think that anyone can possibly believe status doesn't matter anymore. Tell that to the young men who kill each other because they're infringing on each other's patch in gangs.
"Such a culture has certainly defined male interactions in the past." It is still defining it now, sometimes very obviously, as in gangs, sometimes in a less raw form such as in the boardroom, at parties, clubs etc. where men jockey for position.
"In this way I think such a culture is both natural and changeable and a much greater cause of female suffering than the actions of men, at least relatively young men (middle aged on down) who have never known a society without women's rights being legally protected and advocated."
Sorry but you're falling into the trap that every society has fallen into of believing that just because women have won some rights (from an unbelievably low base) we're all pretty much equal now and the problems have gone away.
1 in 4 women get raped or sexually assaulted. 1 in 4 live with chronic domestic violence. 1 in 3 men under the age of 25, agree when asked in surveys, that rape victims are partly responsible for their own rape if they were drunk or flirting with their rapist earlier on in the evening. Most men under 25 have accessed porn, most of which is violent and misogynistic. 1 in 3 girls experience sexual harassment at school (not from the teachers, from their fellow pupils). Do you really think that young men are any less sexist than older ones? I don't think so.