I don't recognize this person - What someone says when they think they're the only one who m

What someone says when they think they're the only one who matters and they don't know who the other person is.

I don't recognize this person. They're not me. They're just a nobody.

I don't recognize this person. They're not famous. They're just a nobody.

I don't recognize this person. They're not cool. They're just annoying.