I'm probably not just speaking for myself when I say that I sorta gauge a PD's bend by resident personalities. I think residents create an overall "theme" at programs and you get a good vibe for whether the PD would take you, if all else were equal. Surely the nicer, outgoing residents self-select when it comes to being the one to represent the group and show applicants around, so it's not always easy to say...But if a PD is nice and his/her residents come off as majorly arrogant, then I def pick up on that discrepancy. This is usually most evident at those programs where I get the vibe that some applicants are invited just to cushion the rank list to avoid going unfilled. Makes me wonder if some places really do have a rank in mind for you before they even meet you and whether the interview won't change much, just fills a "I interviewed them" quota?