that story repeated several times within the span of the book of Genesis as you can learn when you read other texts detailing histories of these times... even in genesis... for example, joseph, or was it jacob... the one with the blind father blessing the kid with the fake hairy skin strap-ons prescribed by the mother? stealing blessings and then wanting to kill the silly thief

the actual facts, as far as i can tell, about this, was basically that The Lord was a human visitor and "the offerings" were literally a table of food to eat, and Cain put no meat on his table and The Lord prefers barbecue sheep because it is tastier and beans are farty