Answer:
Ad Hominem
Step-by-step explanation:
Ad Hominem fallacy occurs when the opposing side in an argument attacks the personality of the opponent instead of the issues raised by him.
In the statement above, the the opposing side committed a fallacy when they decided not to address the issue raised by the Gorps which is that "all you need to be happy is green beans", but rather indirectly attacked the personality of the Gorps by saying that they do not have their heads on their shoulders.