The intro paragraph threw me for a while, too. The author says he stopped liking Scott Alexander's posts because of the tenor of Scott's politics. Usually in the past couple decades when someone's said that it's meant "Scott's too Republican-coded for me on things like race and feminism"; but this post's author is actually arguing that Scott is too Democratic-coded for him on social issues like crime (and, by extension, immigration and race: TFA's author doesn't approve of the number of "obviously illegal" food trucks he sees on the street, for example).