Roseanne Barr Laughs at Trump Taking Credit for Her Huge Ratings

Roseanne Barr thinks it's laughable that President Trump kinda tried taking credit for her massive ratings for the premiere of her revived TV show last week ... literally, she LOL'd.

We got the sitcom star Monday night at LAX, where our photog asked what she thought of Trump plugging himself and his supporters for giving "Roseanne" a big bump last Tuesday.

She doesn't hide her feelings about that -- hilariously ridiculous, at least that's how it sounds to us. Then she drops this on us ... there's only one person responsible for the success of the revived "Roseanne" -- and it ain't DT.