So quick story time, it's anecdotal but it fits with what you two are talking about. I'd like to start with, in my defense, that a lot of time nuances escape me.

I had made some friends with some younger coworkers. I'm still youngish, so they weren't radically younger than me mind you, it was about a ten year age difference. The difference is enough though that we worked on slightly different wavelengths. They used a ton of shit like snap chat, tinder, instagram, etc. where I just use my phone as a phone/sometimes internet box. We all decided after work to go to a new barbecue restaurant in town. When we all sit down, they take the first two or three minutes taking pictures of their food and saying "Oh, I'll send this to so and so" and "blah blah blah." Kind of wanting to fit in, I took a quick picture of my dinner and texted it to my wife with the message "The new barbecue place. Don't you wish you were here right now?" I didn't get a response from her, but sometimes she doesn't text me back on the most simple things until half a day later, so I didn't think one thing of it or another.

When I got home that night though, I came home to an angry wife. My sending her that text genuinely made her upset with me. I was out with good people, eating good food, and that one picture, that little text, was like rubbing it in her face. "I'm having fun, you're not. I'm eating good food tonight, you're not." Now, in my defense I did tell her what I was doing and where I was going, so it wasn't the dinner that made her mad. It was solely the text, something that was supposed to be a gag. Did my execution suck? Sure. Did she over react a bit? Probably. But also, like you're pointing out, maybe this whole taking pictures of our food and our vacations and our new cars is all a bit silly to the point of being damaging.

I talk about my car on here sometimes, and I worry about coming across as bragging. I share some of my antiques on here, and I worry about coming across as bragging. I don't mean to brag, ever. I like to share. I think the line between the two though is nebulous at best.