Kevin Durant is calling Jay Williams out for allegedly fabricating an entire story on national TV ... saying the whole thing is a "f***in' lie."
Here's the deal -- Williams recently shared an interaction he claims he had with KD at a holiday party a few years ago ... saying the Brooklyn Nets star confronted him over a comparison to Milwaukee Bucks superstar Giannis Antetokounmpo.
Williams claims Durant was HEATED and said, "'Yo, don't you ever compare me to Giannis again! Don't you ever do that!"
