L.B.E.
L. B. E. is when someone is so tiny in brain size that they think they're the biggest person in the room.
'You're so dumb, I can’t even believe you exist.', said by someone who still believes in fairies.
'You're like a baby who still cries at night.', said by someone who still cries at night.
'You’re not even worth my attention.', said by someone who texts you every day.