From the way Sans talks about it, he makes it sound so noble. Asriel, bravely risking his life by taking the fallen human - the future of all monsters - to their final resting place, sacrificing his own life to grant his dead sibling's last wish.

The story wasn't lost on Asriel. It surprised him the first time he heard it, stirring up some lost feeling that Asriel couldn't grasp at as a flower... and by whichever number of resets it was, he remembers laughing. Mocking it.

That's how you choose to remember me? You idiots.

They left out the part where the death was planned, and that the noble "sacrifice" was originally meant to be a plan to collect six human souls. A plan that almost ended in the death of several human villagers.

Asriel bites his lower lip, tears springing to his eyes before he can stop them. He quickly starts rubbing his eyes with the sleeves of his shirt.

"U-um... thank you."