This is why you don’t talk when you’re even slightly annoyed. It’s never correct to say, “That’s because you are not an intellectual.”
English isn’t her first language, so that kind of nuance is misplaced. This is how it started: she said she looked fat in her new bikini. For the record, the correct reply to that assertion is, “No you don’t. You look like a wet seal if it had to wear a two-piece.” What you don’t say is, “I feel fat, too.”
Later, when she says, “You just called me stupid,” even though what you actually said was, “You’re not an intellectual,” don’t respond with, “What I meant was, you’re more corporeal than cerebral.” And when she says, “What?” you definitely don’t double down and try to explain.
That’s not when you remind her that she’s from Europe. You don’t say, “You grew up behind the Iron Curtain,” or, “Romania is a second-world country.” It’s really not the best idea. It’s not even a good idea.
I thought it was funny in real time. She didn’t think so.