不识大体

to give no consideration to the bigger picture (usually implying selfishness)

can't recognize tall or short (idiom); doesn't know what's what

not understanding things (idiom); devoid of sense

lit. to see a leopard through a narrow tube (idiom); fig. to miss the big picture

lit. not knowing what's important (idiom); no appreciation of the gravity of things; naive

to show no understanding of the times (idiom); cannot adapt to current circumstances; not amenable to reason