So what makes you think that young people aren't interested in the Apollo 11 mission, or the Apollo program? I mean, from the sounds of it, you have a couple of examples of young people who don't wish to see a documentary at the IMAX - not really representative of an entire generation (or generations).
From an engineering perspective it is cool, the challenges, the solutions, the sheer effort, but expecting the following generations - who had different "landmark events" in their youth - to share the same views you have is somewhat naive. It could be that the younger generation watch far more media, and therefore exposed to more hype than yourself. In the past few weeks, mentions of the moon landing have been everywhere and I'll admit to becoming slightly tired of it.
This isn't NASA's fault, this isn't a generation thing, this is the modern media jumping on any bandwagon they can, and saturating peoples interest, so maybe the person at your wife's work was simply tired of hearing about it - and the implication that he/she should be amazed/interested.
I wasn't alive when we landed on the moon, or for any Apollo missions, I don't have any fond memories of it happening to relive.