Jaycee Chan

Jackie Chan served up a can of whoopass on his own son, but he didn't use his fists of fury ... he used his words. Sticks and stones ...

Jackie Chan says he's "VERY ASHAMED" of his son Jaycee -- claiming his 31-year-old son humiliated his family after getting busted for pot in China. Chan's son was caught in a huge drug crackdown last week -- with cops saying they found about 3.5 ounces of the green stuff in Jaycee's Beijing home.…