That's an especially crappy comic, even for an xkcd.
We don't all agree that beer tastes bad, but a lot of Holden Caulfield-ish high school kids (the main xkcd shirt buying demographic) would agree to that to demonstrate their intellectual superiority. Like it's a open secret that people don't like beer, but it's just an excuse to get drunk, and ole Randall is holding his nose because beer is terrible but he still wants to drink.
How precious.
We don't all agree that beer tastes bad, but a lot of Holden Caulfield-ish high school kids (the main xkcd shirt buying demographic) would agree to that to demonstrate their intellectual superiority. Like it's a open secret that people don't like beer, but it's just an excuse to get drunk, and ole Randall is holding his nose because beer is terrible but he still wants to drink. How precious.