As someone who is familiar with the staff there (all of them are on the staff here too), I can say that they are good people generally speaking. Most of them are indeed Democrats/left leaning, but there is no conscious effort to treat right leaning posters any differently. Trust me. Your experience should not dissuade any right leaning people from signing up there (if the sign up actually works now lol).
As far as threatening to ban you for being a sock, that is something that has been peddled by an individual with no investigative capabilities into the matter. What else can be said?