What was with the last star wars family guy episode?

im talking about the Its a Trap one. what was with the end when they pretty much saying how seth green was kind of a fail actor and that he is a douche. And on top of that after the story and the power came back on they started talking about seth macfarlane and how he ripped off the simpsons and just talking bad about him and seth green? I dont understand why they did all that. why would they just hate on one of the voice actors and the creator. Why is hating on himself????