Kevin Durant -- HITS BACK AT FASHION HATERS ... Over Green ESPY Jacket

They called him the "Jolly Green Giant" ... "Gumby" ... and "Walking Pool Table Material" ... but Kevin Durant had a message for everyone who hated on his ESPY fashion last night ... and TMZ Sports has the video.

The NBA MVP had swapped out his green jacket for a more casual look when he hit up 1Oak in Hollywood after the awards show -- and told us how he felt about the hate that was directed his way on social media.

The man makes a solid point -- but still, he did sorta look like his outfit was designed by Will Ferrell from "Elf."