All you're doing is being an anti-snob snob.
That said, it does taste a little different than fresh garlic. If I were trying to impress or was trying to make something garlicky stand out and taste "correct," I'd use the real stuff.
It's ok I guess?
It has a kind of acrid quality, slightly too sharp for my tastes compared to ideal.
Having said that, I've had "fresh" garlic that is worse — usually older — so I can't say its my least favorite option. There's people I know who use dried garlic when I think jarred garlic would be much better.
The only time I think I'd be a little wary of it is with pesto or something like that. Maybe even then it would be good.
Everything has its place.
Peeled garlic in a jar (or especially minced) really isn't the same as what you will get doing it by hand, whether or not this matters enough to you to not use it you'll have to try, I guess.
This is fine; the entire tradition of cooking is about adapting to your available resources and creativity.
Some people take this way too seriously. The author and his friend in the opening anecdote appear to have fallen into that trap.
I use fresh garlic, and minced garlic, and (gasp) garlic powder. In fact, I think garlic powder is a better tool for some jobs. Fight me! (I mean, don't actually fight me, it's just garlic.)
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One caveat: if anyone is curious, seriously try fresh lemons. Its such a different ingredient than the bottled stuff they should not go by the same name, and lemons keep well in the fridge.
In Australia, the supermarket brand Lemon juice has 3 ingredients:
> Reconstituted Lemon Juice (99.9%), Acidity Regulator (Ascorbic Acid), Natural Flavour, Preservative (223)
It tastes identical to freshly squeezed lemons.
Cook however you damn well feel like. Your food tasting good to you and whoever else you're feeding is all that matters, not the opinions of internet strangers on Twitter about how you did it.
Once you really understand things and let go, you can see snobbery as kind of a joke, a fun game to play, instead of something super serious and important. I think all of the people who have strong opinions on, say, Vi vs Emacs are older and mature enough to not take it too seriously anymore, so any "flamewars" about it nowadays feel more like people joking around than an actual battle.