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Why not just take what people say at face value? Lots of internet flame wars start by people making assumptions.
Frankly, I understand if this seems rather marginalizing to women who identify with the HBS/WBT taxonomy, and that's unfortunate, especially if the idea is unity and mutual support.
Rachael, you said you were looking for clarification, so I'll give it a shot (at the risk of putting words in Susan's mouth).
You don't have to identify as anything at all to join and post to this site. I don't particularly like the terminology as used here either, but you need something. (Okay, granted I like it more than you do.) People argue a lot about various terms, and "Transgender" as an umbrella term is always a hot topic -- but it's kind of the underlying assumption of the site, so this isn't the place to argue it.
The other issue is about exclusion in general. Some of the posts in question didn't just talk about the HBS/WBT taxonomy, but were rather condescending toward some of the other groups represented on this site -- and I think that's the main issue.
So, identify how you please, understand the local lingo, however flawed, and don't be hatin' on groups represented here.
I hope that's fairly coherent and accurate.
~Alyssa