The Inquisitor is an Avvar. Dorian tries to be understanding and make allowances for cultural differences. In hindsight, that was possibly his first mistake.

"Betrothed," Wei Ying says indignantly. Lan Wangji can't stop his gaze from darting up to him. Wei Ying understands. Wei Ying is looking at him, wide-eyed and upset on his behalf. "And you don't even like her," Wei Ying says. "I don't even know her," Lan Wangji says quietly. "But even if you did—" Wei Ying starts. "I wouldn't want this," Lan Wangji finishes.