The answer lies in Godora Jr's not so distant past, AKA yesterday at school. He was having a good day, a very good day one would imagine, before he was approached by Lotsalegs. Lotsalegs was the residential bad boy and school bully, and he had big mean words aimed at Godora Jr. Things like "Your dad boned himself" and "Your dad boned himself". These were of course very true but it still made Godora Jr. very upset and everyone else laughed at him which made him only more upset. These were the actions that drove his matricide.