Are credits no longer important?

Rating: 8/10 (24 July 2017)

While I enjoyed this film I was miffed when, as soon as the first graphic hit the scene, the house lights came on. The last scene plays, the screen goes dark, the title Dunkirk appears and BAM house lights. Maybe I'm out of touch but I can't believe that is how Christopher Nolan wanted my experience to be. I spoke to the AMC Theater manager afterwards who informed me that the film comes to them programmed to turn up the lights at the first sign of credit graphics. Is this true? I understand that I'm in the minority of movie goers who actually sits through credits but I feel leaving beforehand is like leaving a party without thanking the host. Why should we, those of us who want the full experience, be compromised by those who want to leave early? Or am I just being a nut?