Yes, this is a hard one.First of all you need to wrap this in positivity. Work through what you know and when talking to them emphasize the manager that you really want to and use phrases like "looking forward to working with Smith".Assholes are ummm, errrr, like assholes, all firms have some and also whoever you work for on day one, be clear that the asshole may be moved into your team, or as he is senior to you, it is wholly possible that he is your manager this time next year. That's your value at risk, so one evaluation has to be whether that is a deal breaker for you.Assholeness is not a constant, he may have got better or worse and maybe you need to recalibrate, so one thing I'd do if I was your HH is try to set up a coffee with the asshole for you to see if that was just a bad hair day. One reason for this is that in some teams, one interviewer is either assigned or decides to take the role of bad cop. Back when I had a real job with managers reporting to me, I'd drop in and ask the nasty questions that ought to be asked but sometimes aren't. That left a friendly relationship with the first line manager.But I'm a nice guy, really, honest