You know, to some degree everyone is right and labels are irrelevant. OTOH, some "labels" represent meaningful concepts that need to be explored. For instance, it is pretty important to determine if you identify as a woman and want to transition to being female and living as a woman, or if you prefer to remain legally and anatomically male and live as a part-time (or full-time) crossdresser (or if you are genderqueer, or any other possible permutation). In practice, the answer to this question tends to matter a lot to many potential mates. We may all be nominally bisexual, but in my experience most people have a preference.
FWIW, a decent percentage of trans females are lesbian (I'd guess roughly one-third, plus a contingent of bisexual and pansexual women), so it's not that rare. I know of quite a few trans females in long term relationships with lesbian-identified cis females, including myself.
Some lesbian women are fully accepting of their partner being a post-op trans female. A smaller percentage are accepting of their partner being pre-op, or even early in transition. However, few lesbians are interested in someone male-bodied who isn't transitioning to female. Contrariwise, few straight girls are interested in someone transitioning male to female. Few pretransition relationships survive transition if the sexual orientation of the transitioner's mate does not match the transitioner's target sex.
