I think it's because the action of showing off your vacation photos and talking about them is something that's established in our culture as a social thing. Yeah we've all joked about how lame it can be to sit through someone's vacation slides when they just go on forever and ever, but for every one of those social interactions there's a hundred where you just make small talk while flipping through and holding your phone for someone to see and it's a moment of human connection and sharing your life with another person.
The AI process takes that same activity and strips all of the meaning from it, rendering it uncanny. It reminds me of the androids in Nier who are emulating the visual aesthetics of human society but don't really understand why they're doing it.