Don't be a snob — you can't judge a person by appearance.
Tips
memory
Literally 'power-profit eyes' — the eyes that only see who has power (势) and money (利). A vivid mental image: someone whose eyeballs scan you for your bank balance.
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Colloquial and pointed — typical use is criticizing waiters, salesclerks, or social climbers who treat well-dressed/wealthy customers better. Stronger than English 'snob'; closer to 'kiss-up, kick-down' in tone.