I would say it is not inherently transphobic. Heres my line of thinking. Anyone feel free to weigh in.
Something most would agree on: A woman attracted to only women is not misandrist or man-phobic because she doesnt want to sleep with men. She can be a misandrist in addition to being a lesbian, but they are not synonymous.
But if transwomen are women, why is she exlcuding them here?
First, sexual preferences do not inherently indicate a general aversion or bigotry towards groups they exclude. Sexual preferences are generally going to be very exclusive compared to the pool of people we choose to associate with platonically. A straight woman may like men, but not be attracted to overly short men, overly pale men, overly skinny/fat men, quiet men, extroverted men, etc. While she may also be bigoted towards these groups, her lack of sexual interest cannot be used as proof of bigotry on its own.
Similarly, a lesbian may have no trouble accepting that trans women are women. Even so, she is likely not sexually interested in all women of all types. This can be rooted in bigotry, but I dont think it necessarily always is.
Anyway the people trying to shame others for their sexual preferences are a pretty small group that mostly exists on Twitter. Unless you count conservative Christians (or any fundamentalist religious groups). Those groups actually are numerous and a real threat to people with non-hetero orientations.
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I am thinking about just walking into the river now that Megaupload is gone and condoms are in porn.-Fubonis