Obviously quite a few people don't know a thing about feminism and use stereotypes they consider negative to try to denigrate it. There was a split in the feminist movement in the 1960's and 1970's and it was more than just Friedan who openly or covertly thought that supporting lesbians would hurt the women's movement. I'm bi (and 50)and even though that view was intolerant (Friendan has since said she regrets her views of lesbians) Friendan was correct-supporting lesbians (and gays) was a risk and has had a tremendous backlash.
But not supporting lesbians also created a schism between feminist lesbians and feminist heterosexuals that took years to breach, as lesbians rightly felt invalidated and rejected, once again. It was one of the reasons lesbian separatism became popular for the more radical lesbian feminists, as lesbian feminists felt rejected by not only society at large, but by feminists as well. But it wasn't just the homophobia of some of the feminists that led to separatism; at the same time lesbians were also encountering hostility from sexist gay men in the gay and lesbian rights movement as well.
The double whammy led to a lot of hostility and the lesbian separatist writings at the time reflected the rage of being rejected not only by some of the women's movement, but by the gay male community as well. Was this a large number of women? No. The number of people who are politically active is small; the number of lesbians is estimated to be 1-10% of the population. Not all lesbians are feminists, in spite of the silly idea that feminists all think alike, many think lesbians do as well. The number of separatists were small, but very politically active and prolific writers, so it seemed huge. There were quite a few women's communities for a while, but like communes, living together usually creates incredible conflicts that most communities can not resolve. A few still remain, but are usually in rural, remote areas so they are not harassed.
One of the best books I read on the topic was by Suzanne Pharr, "Homophobia: A Weapon of Sexism", though it is really an opinion piece, this review of the book points out the flaws but also the strengths of the book:
http://www.schryer.com/homophobia/articl…