Well I certainly don't qualify as a wine "snob" as that suggests I have money.
I do love red wine and it is the only alcohol I drink these days. I remember once talking with this wine connoisseur. I wanted to impress my girlfriend with a nice bottle of wine to go with a romantic dinner I was planning. He ran through some general knowledge to help me make a decision but what most impressed me was when he told me that the best wine is the wine that tastes the best to me. He said that may be a $150 bottle of wine, or it may be a bottle on the $7.99 rack.
The only way to find out of course was to explore. He did end up pushing me towards a bottle that was in the $25-35 range. I remember it was quite excellent.
The problem is, my palette does know the difference between ridiculously amazing top-shelf wine and bottom barrel (not necessarily in price but in quality). No matter what, I can taste the difference. Now, that's not to say there have not been amazing wines for amazing prices. There have been a surprising amount actually. I've had wine that absolutely knocked my doors off when I was told it was a $14 bottle of wine. Easily tasted in the $50+ class.
On the flip side, I've bought $80 bottles of wine thinking I was going to impress my guests, and it tasted like shit.
Still, it would be a rare feat to trick my palette into thinking I'm drinking an outstanding vintage, jammy Zin or Cab to learn it's Bottom shelf/box stuff. It almost always has a scent to it I can smell a mile away.