As I have said already, I was instead simply noting an instance of how even members of a community organized around the goal of overcoming bias can themselves be blatantly biased against certain other beings.

I don't think you've established that this is bias. First, clarify what you mean by "bias" — you seem to be using it more in the colloquial sense of prejudice, while here it's used in a different and more technical sense. Do you claim that this is an instance of a particular cognitive bias, or that it is an unjustified prejudice (which, surely, should also be overcome) based on something like unconsidered anthropocentrism? If the latter, you need to specifically justify the implication that most non-vegetarians here haven't actually thought about the morality of eating meat, and are just going by a default lack of concern for different-looking entities. (Do you think that many LWers would eat Yoda?) I suspect that many among us (as in Kevin's comment below) have considered the question much more deeply than John Q. Omnivore has.

Or if you simply want to argue that their moral reasoning is faulty or based on false factual beliefs, just say that, and say how; that's much more useful then a blanket accusation of "bias". (In general, it's bad argument to tell people that they're being "biased" or "irrational", particularly on a site where everyone is well-acquainted with the more obvious and/or well-documented forms of systematic irrationality. It's too fully general. If someone is wrong, stay at the object level and just tell them what they're wrong about and what you think you know that you think they don't know.)

You're underestimating how seriously many of us have taken our decisions to be meat eaters. All the animal suffering is not something I take that lightly.