I suppose one solution is for women to first gain the trust of the men whose honest opinion they want to hear. Maybe just some comments that explode the unspoken tensions, like “My friend Chad said he thinks my male co-founder should be CEO, and maybe he’s right, but I don’t fully trust his judgement because he can be quite old fashioned and, to be honest, sexist. But that doesn’t necessarily make him wrong in this instance. Could you give me your honest opinion?” It’s then easy for the man to respond.