You can't help it.
You could talk all night long about who's got the best pizza in town, about the largest crab cake you just devoured, or go in detail about this hulking, porterhouse steak that rocked your world the other night, but start the same dialogue about wine, and all of a sudden, the pretentiousness comes out.
Why? I have no idea, but wine = pretentious.
I have, unfortunately, annoyed, offended, and bored to death numerous friends, acquaintances, family, and dinner guests with long diatribes concerning wine. Whether it be different, exotic grape varietals, or new, evolving growing regions, and the differences between oak aged compared to stainless, or just particular vintages of note and disaster, and I have learned through it all to stop talking about wine and just smile, nod, and keep my mouth shut.
When it comes to wine, any and all conversation about it leads to the pretentious zone. It's safer, even if someone is genuinely interested in it, just to drink and talk about the food.
Here is a great article that had me laughing: