Yes to the second question, in that I would give the answer of 2 for A and 3 for B.
Racism has at least three definitions colloquially that I can think of
1: A belief that there is a meaningful way to categorize human beings into races, and that certain races have more or less desirable characteristics than others. This is the definition that Wikipedia uses. Not that many educated people are racist according to this definition, I think.
2: The tendency to jump to conclusions about people based on their skin color, which can manifest as a consequence of racism-1, or unconsciously believing in racism-1. Pretty much everyone is racist to some extent according to this definition.
3: Contempt or dislike of people based on their skin color, i.e. "I hate Asians". You could further divide this into consciously and unconsciously harboring these beliefs if you wanted.
In the sexism debate, these three definitions are sort of given separate names: "belief in differences between the sexes", "sexism", and "misogyny" respectively.
Racism-3 seems to be pretty clearly evil, and racism-2 causes lots of suffering, but racism-1 basically by definition cannot be evil if it is a true belief and you abide by the Litany of Tarski or whatever. But because they have the same name, it gets confusing.
Some people might object to calling racism-1 racism, and instead will decide to call it "human biodiversity" or "race realism". I think this is bullshit. Just fucking call it what it is. Own up to your beliefs.
(I am not racist-1, for the record.)
But lactose intolerance arguably is a less desirable characteristic than lactose tolerance! :-)
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A note for theists: you will find the Less Wrong community to be predominantly atheist, though not completely so, and most of us are genuinely respectful of religious people who keep the usual community norms. It's worth saying that we might think religion is off-topic in some places where you think it's on-topic, so be thoughtful about where and how you start explicitly talking about it; some of us are happy to talk about religion, some of us aren't interested. Bear in mind that many of us really, truly have given full consideration to theistic claims and found them to be false, so starting with the most common arguments is pretty likely just to annoy people. Anyhow, it's absolutely OK to mention that you're religious in your welcome post and to invite a discussion there.
A list of some posts that are pretty awesome
I recommend the major sequences to everybody, but I realize how daunting they look at first. So for purposes of immediate gratification, the following posts are particularly interesting/illuminating/provocative and don't require any previous reading:
More suggestions are welcome! Or just check out the top-rated posts from the history of Less Wrong. Most posts at +50 or more are well worth your time.
Welcome to Less Wrong, and we look forward to hearing from you throughout the site!
Note from orthonormal: MBlume and other contributors wrote the original version of this welcome post, and I've edited it a fair bit. If there's anything I should add or update on this post (especially broken links), please send me a private message—I may not notice a comment on the post. Finally, once this gets past 500 comments, anyone is welcome to copy and edit this intro to start the next welcome thread.