Are women being divisive when they spell their gender as "womyn"?

No, they are just showing how ridiculous certain segments of radical feminism have become. However, the misspelling that I find most amusing is when certain radical feminists will spell history "herstory". This not only shows the pettiness and silliness of the radical feminists but also their ignorance as well, because the English word history is derived from the Greek word for history, and is totally gender neutral.