Oh, I don’t, I haven’t joined any such group, I pretty much consider myself feminist and even donated quite a lot of money to feminist causes before I had to focus my attention on saving some money for personal reasons (though I plan on returning to donating when I have some significant spare money again).
I was just explaining what people really mean by radical feminist and that the claim that it’s about hair color is ridiculous (though I’m sure you’ll find such people, but to paraphrase your question - how many percent do you believe mean just hair color by “radical feminist”?).
To answer your question, my guess would be in the 5-10% range.