Kim Kardashian -- Jon Hamm's Talking Out of His Ass

Kim Kardashian isn't fazed by Jon Hamm's brutal insult in a recent interview -- when he called Kim and Paris Hilton "f**king idiots" -- claiming the "Mad Men" star is running his mouth about things he doesn't understand.

In case you missed it -- Jon unloads on Kim and similar reality stars in next month's issue of ELLE UK, claiming, "Whether it's Kim Kardashian or Paris Hilton or whoever, stupidity is certainly celebrated. Being a f**king idiot is a valuable commodity in this culture because you're rewarded significantly."

But Kim's taking the high road, responding on Twitter moments ago -- "Calling someone who runs their own businesses, is a part of a successful TV show, produces, writes, designs, and creates, 'stupid,' is in my opinion careless."

Kim adds, "I respect Jon and I am a firm believer that everyone is entitled to their own opinion and that not everyone takes the same path in life. We're all working hard and we all have to respect one another."

You'd think Rob Kardashian's protective brother instinct would have kicked in too -- but Rob tells us, he doesn't give two craps about Jon Hamm's insult ... in fact, he doesn't even know who Jon Hamm is (below).