Jackson brushed off Trump's diss at LAX Wednesday. The presidential candidate panned the actor earlier in the day -- denying they ever played golf together at his golf club and trashing his acting.
The whole thing started when Jackson said in an interview he played a round with Trump and accused him of being a cheater on the links.
"Blackish" actor Anthony Anderson jumped to Jackson's defense, saying he'd been part of the golf outing and the two even enjoyed shrimp and hot dogs with The Donald!!
Jackson tells us he's not trying to bring Trump down, but he can't ignore the lie ... saying there's even a trail of proof, including a receipt from the lunch.