Why did the song of the people about slaying 1000s and 10,000s upset Saul?

ANSWER

it credited David with slaying more enemies than Saul

1st Samuel 18 :

6 When the men were returning home after David had killed the Philistine, the women came out from all the towns of Israel to meet King Saul with singing and dancing, with joyful songs and with timbrels and lyres. 7 As they danced, they sang: “Saul has slain his thousands, and David his tens of thousands.” 8 Saul was very angry; this refrain displeased him greatly. “They have credited David with tens of thousands,” he thought, “but me with only thousands. What more can he get but the kingdom?” 9 And from that time on Saul kept a close eye on David.
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