I'm rereading old chapters and saw that in my older comment up there I never did mention what the problem was.
According to the other manga I read it's not a matter of taste, but literally the wine selection is wrong.
Supposedly the wine called "Chablis" has different varieties, and there's kinds that pairs well with raw oysters and other kinds don't.
I'm no wine expert either, but when I searched for it the food guides did say that not all kinds of Chablis are a good match for raw oyster. Especially the most expensive/fanciest Chablis are supposedly best for cooked oysters and not really recommended for raw. That seems to be the mistake there, that people just randomly pair the most expensive wine with the oysters to act all fancy-like, since they didn't know the different kinds of Chablis taste different.
Like yeah, the author is also kinda being hypocritical about what makes food good. They had that big chapter about how blue cheese and matsutake stinks, and later a Kanto vs Kansai flavour, so the author should know that whether you think food taste good is a matter of culture sometimes. The problem here specifically was in having the proper knowledge about the food and wine pairing, though. After many many other food flubs in this series, I wouldn't be surprised if it's just because the author just have poor knowledge of wine and at the time there aren't enough reliable wine experts that could guide him properly.