I have noticed this in forums, political and non-political: when women join, they will post a presentation, they will make friends, they will network. They are very much interested in the people using the forum. They see the forum as a club.

Men are much more prone to simply debate the topics. They figure that's what they're there for. They see the forum as an instrument for debate.

Granted, White men will also network, just like women will also regard the topics unrelated to who posted them, but there is a distinct difference in behavior.

I submit to you that the White male is the part of the human species that is the least prone to network. Jews, other non-Whites, and women, all instinctively gather strength through alliances. The internet forums are a little micro-universe displaying this truth.

Has anyone else noticed this?

Yes, by and large but there are exceptions to the rule. Women are genetically programmed to act in co-operation with others while man, the warrior, the hunter is competitive by nature and will have a keener instinct for debate, seeing it as a form of competition, warfare if you will.
I am not sure that there are necessarily significant differences between Aryan males and non-Aryan males in terms of how they interact on such forums.
National Socialists and White Nationalists will surely see things in terms of `struggle` and will use these forums as an arena for enacting this struggle.