David's friends grill Annie about her fiancé's drinking in a sneak peek of the newest episode of 90 Day Fiancé

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In a sneak peek of Sunday’s episode of TLC’s hit show shared exclusively with PEOPLE, 48-year-old David’s American friends have a serious talk with his 24-year-old Thai fiancée about his drinking.

“He disrespected the f— out of you, and I don’t know nothing about Thai culture and how you all do things when it comes to relationships, but here if a woman f—ing disrespected me like that, it’s not gonna be a relationship,” Antonio, who is the brother of David’s friend Nikki, tells Annie. “You can’t change anything he’s not ready to do, and right now he’s not ready. How can you be ready to marry him?”

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“He’s in denial about the drinking. He doesn’t see it as a problem,” adds Nikki, who is married to David’s best friend Chris and is hosting the couple in their home. “It’s a f—ing problem.”

After David overhears the trio discussing how Chris needs to treat his friend like a “grown man” instead of his “mama,” he shoots back at Antonio, saying “Oh yeah? That’s ’cause you want to f— him.”

David and Antonio almost come to blows as the latter tells Nikki he “will beat the f— outta him.”

“Did you hear what he just said?” he asks his sister as David tries to put his hand on him. “No, don’t f—ing touch me because you will get f—ed up … I will beat your f—ing ass.”

To see how the drama plays out, tune into the newest episode of 90 Day Fiancé, airing Sunday at 8 p.m. ET on TLC.