I'm with Mobilis; you can't be a connoisseur of everything. It just sounds like snobbery to me.
That said, there's nothing wrong with being discerning in some areas. It's just important not to overdo it, I think.
I've gotten a taste for good tea and so order middling good from a small business I used to live near. Now, there's much, much better tea available for order that I could pay 10, even 100 times as much for. They're not worth it, I'm pretty sure. I can, however, tell the difference in a blind taste test from one of my blends and a slightly-cheaper grocery store tea, so I pay the premium to some folks I happen to like and get a beverage I really enjoy.
One might even be able to make the case that a certain degree of discernment can probably make you more Mustachian by teaching you to truly appreciate things, rather than wantonly consume cheap crap. A certain degree of discernment and know-it-all snobbery are two different things, though. You can be discerning, and appreciate quality, and still go for the cheap stuff day-to-day because that's what makes sense to you-- if you don't let snobbery get in the way. (i.e., "This wine comes in a box! It could never compare to the 200$ wine I sampled last summer at..." -- they're both wine, so yes! It can compare. You might be able to tell the difference [though I've seen some double-blind studies that suggest otherwise] but it's a difference in degree, not in kind. )