Sorry, the title is a bit vague. I'm trying to find a word to describe someone who, for example would say "what's her face" instead of a person's name. You know they very well know the person's name. They are trying be mocking or make it seem as if it's a person they don't care about.

I was thinking they are being facetious or sardonic. I don't think those are the correct words to describe how the person is acting.

I feel like maybe there is a more specific word?