Clint Eastwood‘s daughter has been bombarded with vicious online death threats after she publicly demolished a $100,000 Birkin bag in the name of art.

Francesca Eastwood, star of “Mrs. Eastwood and Company,” and her BF Tyler Shields took a chain saw to the pricey bag and then LIT IT ON FIRE … which has angered dozens of fashionistas (and many who are just economically challenged).

Eastwood has been receiving death threats via Twitter and Facebook, such as:

— “Some of us actually have to work and live check 2 check, spoiled rotten bitch to burn 100k bag.”
— “You’re a stupid whore. How f***ing dumb can you be.”
— “You should kill urself, ungrateful bitch – wasted money when families can’t eat.”

Sources close to Francesca tell us … the 19-year-old said she knew people would be shocked, but never expected this level of hatred. We’re told she’s been telling friends … people just don’t understand art.