Earlier quoted context omitted.
I don't fully buy this. I expect my chosen jazz critic to be knowledgeable, like, a lot. Same for food and wine. I want to read the words of someone who has eaten on more places, more foods and more flavors than me, not less. Your friend might be too humble.
But even then, they're not any better at 'tasting well'. You don't have to care about the fancy properties of the wine, just whether it tastes good to you.
Some things you get more out of if you choose to spend time with them, but will in turn change your own sense of it, and the experience you are having.
So in some sense you actually do become "better " at tasting/listening well - or at least you become more sophisticated. Which doesn't invalidate the enjoyment that someone else can get from a more superficial engagement, at all.