logical-fallacies
Explanation
The Joke
A woman is making a political argument about taxes, dismissing opponents of higher taxes as stupid. She uses a rhetorical question to illustrate how absurd she thinks their position is: "What do they think? Like, the government's going to spend that money on giant robots made of dried grass?" A man immediately identifies this as a logical fallacy, shouting "That's a straw man!"
In the final panel, the comic takes the pun literally: an actual giant robot made of straw (a literal straw man) appears behind them, roaring "RAAA!" and chasing them both down the street. The government apparently did spend the money on giant robots made of dried grass after all.
The Humor
The joke operates on three levels simultaneously. First, there is the straightforward political humor of someone making a straw man argument (misrepresenting the opposing position to make it easier to attack). Second, the other character calls out the fallacy, representing the internet-era tendency to identify logical fallacies by name during arguments. Third, and most importantly, the comic takes the term "straw man" completely literally -- the woman's supposedly absurd hypothetical about the government building giant robots made of dried grass turns out to be true. This literalization of the metaphor both undercuts the person calling out the fallacy (the straw man is real, so it was not really a fallacy) and creates an absurd visual gag of two debaters fleeing from the very concept they were arguing about.
References
A "straw man" fallacy is a common logical fallacy in which a person misrepresents their opponent's argument, making it easier to attack. Rather than addressing the actual position, the arguer constructs a weaker version (a "man of straw") and defeats that instead. The term is widely used in informal logic, debate, and internet discourse, where identifying logical fallacies by name has become a common rhetorical move in online arguments.