Wouldn't it be more appropriate for Ms. Bellum to say "who is whom" instead of "who is who" in this context?

Native speaker’s answer
Rebecca
Grammatically "who is whom", is correct! Well spotted. In casual conversation, it is considered fine to use "who" instead of "whom". Ex: Who does she think she is?! Ex: He was with whom? Ex: I gave the present to who I wanted to give it to. => grammatically incorrect