With Handy's post about pretentious people I do know one person who kinda fits the description. Basically she talks about how she only drinks craft beers and is overly snobby about food but isn't particularly knowledgeable about it from my experience. Her mom *****ed out some waitress at Famous Dave's once because she's from the south and "knows good BBQ"

(also why the **** did she take her mom to Famous Dave's in the first place...? The third paragraph might explain that)
The funny thing is she came over when people were hanging out at my birthday back in April and brought all these weird craft beers that aren't very good. They were still in my fridge as of last night and I finally got rid of them. some local brewery's porter (fine but I'm not a big Porter guy esp. this time of year), a vanilla bean blonde ale (lol!), and a Boysenberry Sour(ended up pouring most down the drain). I like some craft beers and have drank enough of them over the years to have developed a taste for the various types of beer but honestly if it's summer and it's not a good lager/pilsner I'd rather drink a Coors Light/Mich Ultra/Mich Golden than any of those. Those don't have nearly as much flavor obviously but I can drink regular *** beer and not whine about it. And nowadays I vastly prefer cocktails or even just bourbon/rum on ice (and if I go out it's usually a vodka soda w/ lime). Some of this is due to being more concious about my weight, some of this is due to the fact that beer is just heavy and I feel like it weighs me down/makes me tired especially when I'm out late drinking, and some of it is because like Handy said, I'm not pretending to be something I'm not and don't generally care what others think about my choice of beer. )Even my Spanish friends give me crap about it sometimes but honestly, what is the difference between Modelo/Corona and Coors other than like 80 extra calories?) Anyhow to me it's funny, she's this beer snob but it doesn't even seem like she has any idea of what she's talking about. I can understand drinking a single porter as a dessert beer but on a summer day there's next to no chance that I'm drinking one out in the sun. Obviously you don't have to follow any rules for drinking beers according to the time of the year or anything but people typically do that for a reason, it just makes more sense to drink lighter beer when it's hot out. I'd also argue acquiring a taste for beer doesn't take as much effort as acquiring a taste for Bourbon/Scotch. Anyhow, long story short, I don't care what she drinks but the fact that she's a snob about beer and judges others for the beer they drink but has no idea what she's talking about is what makes this all funny.
As for food she's the type who might go to fancier places that are expensive and probably have good Yelp reviews but couldn't tell you any of the hole in the wall places that have solid reasonably priced food with decent portions or even been to the places that have been on DDD. For someone who's a BBQ fanatic you'd think she'd know about Qfanatic or Smokey's but apparently not until I took a group there. And then when we went to those places she'd say how they're good but not the south (which is totally believable but at this point her knowledge of that is in question).
So yes, in short, these people exist and I was kinda on the same page as Kepler until I remember that she existed