Historical lack of solidarity amongst oppressed groups/ downside of intersectionality

I find it interesting that there seems to be a historical trend of already oppressed or marginalized groups wishing to further distance themselves from other members of their group whom society perceives as being even farther from the spectrum of what is considered “normal”. For example, many of the first wave feminists wished to distance themselves from lesbians, because they did not want their cause to be associated with them. While I found this very disappointing, I also found it interesting that they would not want to form a solidarity against the society that is oppressing them all, rather than further dividing their ranks. It made me wonder, does the structure of this sort of exclusionary behavior discourage a sense of solidarity amongst these "outcasts" of society? We discussed this in another of my classes, and someone brought up how, if an individual were to emphasize the role of intersectionality in their own life, they would be potentially limiting their support group because they would find fewer people with each of the forms of oppression.