Warriors guard Gary Payton II just earned the respect of one NBA fan in Indiana ... 'cause after he accidentally spilled the person's drink, he made sure a replacement got sent over ASAP!
The 29-year-old -- who just so happened to be mic'd up when the interaction happened -- inadvertently knocked over the Truly while he was leaning over some railing on Golden State's sideline.
The son of Hall of Famer Gary Payton was immediately embarrassed, saying out loud, "My fault! My fault!"
But, seconds later, he made things right.