Yes, some butch lesbians do not seem to conform to any ideal of beauty, whether gay, trans, or hetero. They seem to willfully contradict every biological or sociological ideal for a female body.
However that has nothing to do with the fact of their existence, or whether some other people find them attractive. That is entirely within the human mind, and that is a most wondrously diverse and illogical place. They exist in their own right, and have every reason to do so, just as you and I.