Tā yìzhí bèi dàjiā kànbiǎn, zhōngyú yòng chéngjì zhèngmíng le zìjǐ.
He'd been looked down on by everyone, and finally proved himself through his results.
Tips
memory
扁 literally means "flat". 看扁 = "to see someone as flat / two-dimensional", i.e. as less substantial than they are. Common in the challenge 你别看扁我 ("Don't underestimate me").
