Lumpy’s father would get upset when the boys called his son Lumpy.
IIRC, Mr. Rutherford was a dork and although Ward and June tried to be nice to him - they didn’t like him.
No he wasn’t a dork. He was just proud of his son. Ward and Rutherford worked in the same office and Rutherford was always saying what a great boy Clarence was. And when Lumpy did something dumb, Rutherford was naturally embarassed.