HN is not evenly supportive of the trans community (if you look at many of the comments on here). There are a number of quasi-libertarian religious people that are transphobes, but they persist as they often mesh well with the general libertarian bent of this site when commenting on articles.
HN is divided wherever society is divided, as is true of any sufficiently large population sample.
Actually I should say "societies", because it's a highly international community, and these lines are drawn differently in different countries. Mainstream positions in one may be extreme in another. The same is true of regions within countries.
As for "libertarian bent" or other ideological biases, this is mostly in the eye of the beholder. We see just as many comments like, say, https://news.ycombinator.com/item?id=15307915.
