Hi MegamiTensei!
There are multiple ways to reach the best ending. You can avoid that argument entirely, but you don't need to -- it's possible to bring the conversation back on track.
In general, pay attention to the attitude each choice has. Is it dismissive of Santa? Does it throw blame around? How honest is it? Think about which will yield better results.
SPOILER:
When Santa asks "So that's how you feel about your old man?", a Flappy Bird segment will start. One answer will have a clearly different attitude than the rest. Keep flapping until you find it!
Thanks for playing and leaving a comment! Happy Holidays!