Determining that your culture is broken is hard. It would be great if you could trust your employees to tell you. But a) they’d need the courage to do that, and b) the person complaining would have to be a good cultural fit themselves or the complaint might actually be a compliment (your culture is working and therefore the complainer, who can’t get with the program, doesn’t like it), and c) most complaints about culture are too abstract to be useful.