I interview people pretty frequently at work and beyond skill set, I really am just looking at how a person communicates, if they speak graciously about their current or former teammates, and their thoughts on working as part of a team. Our work is very team based regardless of position, and I need to know they can be happy being respectful of everyone on the team if they join us. Moral of the story- be pleasant to all. It makes work (and life) happier for everyone.