I didn't hear what she said.
Were you not interested or just not listening?
I only heard the word "what" which I didn't understand.
It sounds like you weren't interested. It's not nice to not listen to what people are saying.
You are too nosy and you should mind your own business.
I think it is rude to not listen to people. I think you should put in more effort to listen to what people are saying. If you want to be friends with them you give them that respect.