a case of the 'don't know ya's
When someone you’ve bumped into like five times acts like they’ve never seen you before, probably because they’re too dumb to remember your face.
At the grocery store, my old math teacher ignored me like I was a ghost.
My cousin’s best friend saw me at the mall and acted like I didn’t exist.
At the movie theater, my friend’s ex said, 'Who are you? I don’t know you.' Like I was a stranger from another planet.