I couldn't figure out what was going on, because this tendency you describe was on full display right from the beginning. They invited us into their home then started giving us shit as soon as we walked in the front door. I thought they were just snobs and wanted to say fuck your stupid staircases and stroopwafel ain't shit (lying of course), but held my tongue because it wasn't my family. My wife on the other hand wasn't as restrained and gave it right back. Hearing Oom Rob laugh at her precision strikes made it all clear. We got along great after that and really had a fantastic time.
For what it's worth, I find Russians are expert at this as well.