Disorderly conduct charges have been filed against a 58-year-old Racine woman accused of threatening visitors to her home with a knife.  Rosemary Hobson was arrested Wednesday.  Her roommate told police his guest and her five-year-old daughter were sitting on furniture belonging to Hobson.  He says they moved when she became angry, but she reportedly returned to the room in a few minutes holding a steak knife and making threats to stab them if they didn’t leave.  The roommate got the knife away from her and held Hobson until police arrived.