Will Thorne Staff WriterEllen DeGeneres addressed reports of mistreatment and misconduct behind the scenes at “The Ellen DeGeneres Show” in her opening monologue of the season.In the seven-minute opener, DeGeneres apologized “to the people that were affected” and said she is “taking responsibility for what happens at my show.”“As you may have heard, this summer there were allegations of a toxic work environment at our show and then there was an investigation.