柿子挑软的捏

shì zi tiāo ruǎn de niēshizitiaoruandenie

1. lit. it's the soft persimmons that people choose to squeeze (idiom)
2. fig. it's the weak (i.e. 軟柿子|软柿子[ruan3 shi4 zi5]) who get picked on
3. bullies pick soft targets

Study it in Yanamino