As your parents get older, and in general as well, it's hard to see them as normal, fun loving people. Can you even imagine your parents twerking together at the club? Or can you imagine your parents doing it? Even if you don't want to think about your parents having sex, you're thinking about it right now, aren't you? That's the problem with even bringing it up. There are several problems, actually.
These two parents are doing exactly what a young couple would do on instagram. It's just weird seeing two grown adults do it. Seeing adults being silly is a disturbing thing. "Aren't you supposed to be dull and unhappy? I thought that was all of our fates. To grow old, dull and unhappy?" That's what I scream at old people whenever I see them acting young.