He isn't complaining about their choice, but instead that they made choice A, and are complaining they aren't getting the results from choice B. It's like part

He isn't complaining about their choice, but instead that they made choice A, and are complaining they aren't getting the results from choice B. It's like partying instead of studying for a test, and complaining you didn't pass. Of course you didn't; you chose "fun" over "boring".