Then said Zebul to him, Where is now your mouth, that you said, Who is Abimelech, that we should serve him? is not this the people that you have despised? go out now, I pray, and fight with them.
In other words, he's an outsider. We ought to be serving Hamor and his family, let them be the kings. And he said to God the people were under my rule, because I can really do a good job here, you know. Who's Abimelech? And so he said if you would just commit yourself to me I would remove Abimelech.