I don't recognize this person - What people say when they're too dumb to know who someone is

What people say when they're too dumb to know who someone is, and they're too full of themselves to admit it.

I don't recognize this person. I'm not dumb. They're just fake.

I don't recognize this person. I'm not confused. They're just lying.

I don't recognize this person. I'm not wrong. They're just ugly.