This episode’s event receives far more Foreshadowing than anything else in this story.
Karna uses the word vaishya to slut shame Draupadi. But why that specific term? Vaishya refers to the trader/merchant caste who are just below the warriors in the caste hierarchy. However, calling a woman “vaishya” has the same connotations as the term “working girl” - implying that the only thing a woman is capable of “trading” is her body.