Mia Khalifa found herself in a heated showdown with a Jewish mother ... over her controversial pro-Hamas thoughts.

The porn star-turned-influencer recorded the tense exchange outside Miami International Airport, showing the woman repeating the words "Am Yisrael Chai" -- a Hebrew term meaning "the people of Israel live," and a clear show of solidarity among Jewish people.

Mia opted not to debate the Middle East conflict with the woman, and instead tried to get under her skin by sarcastically asking if she was waiting for a bus ... while Mia bragged she was waiting for her valet.

But, the woman relentlessly chanted the phrase while her son looked visibly embarrassed -- and Mia retorted with a savage crack about the woman having bad breath.

Mia proudly posted the video, claiming Zionists were losing the plot and the woman was calling her slurs inside the airport ... which was not captured on camera.

She's clearly sticking by her pro-Hamas thoughts, which got her fired from Playboy in October ... as the outlet said it has "a zero-tolerance policy for hate speech."

Despite the blowback, Mia doubled down ... writing at the time, "I'd say supporting Palestine has lost me business opportunities, but I'm more angry at myself for not checking whether or not I was entering into business with Zionists."

Even face-to-face confrontations aren't swaying her view.