I frequent Breitbart and don't find the site bigoted at all.  It doesn't promote identity politics or any of that nonsense but having political views you don't agree with doesn't make the site bigoted.  This is another prime example of liberals assuming an unearned moral high ground over people with ideas they don't agree with.  The jig is up.  Moral attacks on people don't win any debates anymore.  
Sleeping Giants is just doing whatever it can to silence opposing viewpoints via trying to damage conservative news sites like Breitbart as much as it can.  You know, "bigoted" viewpoints like "equality of opportunity over equality of outcome", or "personal responsibility" or "we are the result of the choices we make."  
Sleeping Giants is Exhibit A of why the left is losing.