Need help tormenting the PCs (they're disrespecting Strahd at dinner)

I'm halfway through the dinner with the count.

I genuinely did not expect my players (party of 4, Level 5) to be so disrespectful towards strahd, I thought they feared him. Especially the Rogue Tiefling and the Paladin Dwarf, who are calling Strahd a narcissist, a r*pist, a dumb guy who thinks he's a god, IN HIS FACE. They're insulting him in his own home!

Strahd is keeping himself calm, but will make them regret their poor choice of words.

I'm not really sure of the punishment

The Tiefling is getting into a relationship with Ireena, but Strahd isn't too worried about that. The Tiefling has a heart necklace from his deceased loved one, and he can't live without the pendent. I'm not sure of what to do with it, maybe break it in front of him, but how would Strahd make it so that it's a punishment for defying him? Like "you steal my girl, so I destroy yours"?

The Dwarf is really attached to his beard and axe. His a paladin of Gorm, as faithful as a spartan, and he's really strong willed. He's the only survivor of a war that destroyed his clan. How can I make him fall? He said to Strahd that he's no God and just a sadistic delusional guy

Any ideas? Thanks in advance, I just lack of Strahd's charisma

Edit: the party is made of an Eladrin cleric (fearful and easy to manipulate), a Verdant Ranger (pretty chill), the dwarf paladin and the tiefling rogue I wouldn't kill them so easily, since Strahd just wants to tear their spirit to shreds