It means two things: 1: The author, Kenneth Myers - a lesswronger himself apparently - wants to give advice on socializing to the rest of the community. I'm not sure how good the advice is.

2: He sees something odd about lesswrong, which isn't just that lesswrongers have different beliefs to other people. lesswrong is not just a bunch of people discussing weird ideas (in which case it would be ignorable), but neither is it discussing ideas which are part of a traditional academic discipline (in which case it would also be ignorable, as it would be the published work that would be important). I think that it's this in-betweenness which makes people uneasy