Ah, I see.
Yes, Kaibara can be a very prejudiced person. Whenever he talks down on something, it is sometimes based on actual fact, but can often be based on personal prejudice. Kariya often uses him as a mouthpiece for gourmet opinions that he disagrees with.
I think what's happened is that Kaibara built his opinion of French cuisine on what he finds in restaurants, that being fancy foods doused in lots of creamy sauce. If he built his opinion on Chinese cuisine similarly, he'd have visited Chinese restaurants which serve elegantly prepared and beautifully crafted dishes. That much is just my assumption though, based on what I know of Kaibara's character and how the manga presents different cuisine.