There is a strong local convention against discussing topics for which certain positions are strongly enough affiliated with tribal identities that the identity-signalling aspects of arguments for/against those positions can easily interfere with the evidence-exploring aspects of those arguments. (Colloquially, "mindkilling" topics. as you say.)
That said, there's also a strong local convention against refraining from discussing topics just because such identity-signalling aspects exist.
So mostly, the tradition is we argue about what the tradition is.
For my own part, I prefer to avoid partisan-political discussions (sometimes "Blue/Green discussions" colloquially) here, but I don't mind policy-political discussions. In the US, race is more typically the former than the latter.
I had assumed he was an outlier on lesswrong,
I certainly agree that he's an outlier.
that most folks here would take an agnostic-leaning-not-racist stance in the issue.
There are interpretations of this sentence I would agree with, and interpretations I would not agree with, and I would expect the exercise of disentangling the various interpretations to be difficult.
agnostic-leaning-not-racist
Analogous to "agnostic atheist". A person who, in absence of compelling evidence for or against the claim that racial differences in intelligence are genetic in origin, prefers to refrain from opining on the issue. If pressed for an answer such a person would guess that racial differences are probably not genetic, because they judge this to be the more parsimonious answer.
Well...on one hand, mindkilling, strong social pressure to signal non-racism, political undertones, potentially triggering topic for people on the ...
A few notes about the site mechanics
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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.