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shokwave comments on Boltzmann Brains and Anthropic Reference Classes (Updated) - Less Wrong
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I feel like I should be able to hyperlink this to something, but I can't find anything as relevant as I remembered. So here goes:
Your reference class is not fixed. Nor is it solely based on phenomenal state, I'd argue, although this second claim is not well-supported.
That is, Boltzmann brains are in your reference class when dealing with something all sentiences deal with; for progressively more situation-specific reasoning, the measure of Boltzmann brains in your reference class shrinks. By dealing with concrete situations one ought to be able to shrink the measure to epsilon.
I think Bostrom's claim is that no matter what situation you're dealing with, all observers that are subjectively indistinguishable from you must be part of your reference class. Whether (and which) observers who are subjectively distinguishable get to be part of it will depend on what you're reasoning about.