Have you noticed that people get weird about lesbians having a physical 'type?'
I feel like people expect lesbians to find every woman stunning and beautiful and perfect. You see it all the time online with (supposed) bisexuals joking about how they're attracted to every woman and 2 men (crazy how they always end up with one of those two men!) I was chatting with some of my friends at a bar the other day, and the topic of our 'types' came up. One of them started regurgitating that kind of crap about how every woman is so beautiful, then turned to me and went "I bet you don't have a type at all, women are so gorgeous!" No... I definitely do, just like everyone else does. The whole group started acting genuinely surprised and somewhat offended when I pushed back on that idea.
I think it relates to people subconsciously not seeing lesbianism as a valid sexuality, but as more of a choice or political statement. No other group is expected to find every single person in their potential dating group attractive. Straight people, gay guys, bisexuals are all allowed to have preferences. Only lesbians are expected to be completely impartial about their dating pool.