Sat, Jul 28 2012, 09:47 PM EDT
That argument's a mixed bag.
It's absolutely true for things that are mostly about personal taste. Art, music, food, that kind of thing.
It falls down in two places, first if you make the argument from personal taste, you pretty much have to accept everybody's taste. Taste is subjective yes, but taste cannot both be subjective and universal.
Second, if you want to actually talk about something, you need to know a bit about it. You don't need arcane and specialized knowledge but to extend the cooking metaphor, if your knowledge ingredients and techniques is limited to take out menus and instant noodles, you are not going to be able to tell me anything meaningful about a restaurant's food, or participate in a discussion of that restaurant.
I've seen a lot of discussion go to hell because people mistook their tastes for a universal standard, or because people who were only reacting on an 'I like this level' wound up in a technical discussion that they were not prepared to engage with.