I generally agree with you but signaling membership is far from the sole reason people like art - for example: the existence of hidden "guilty pleasures" indica

I generally agree with you but signaling membership is far from the sole reason people like art - for example: the existence of hidden "guilty pleasures" indicates purely aesthetic enjoyment! I personally like fountain pens and riding a one wheel despite really hating the cultures around both of them But the key point you're making - that good art only exists in a specific context - I totally agree with. Good taste/art exist only in relation to a specific culture, and depends on what that culture values (technique, creativity, bold ideas, traditional ideas (for example: pre-romantic period, good composers were seen as empty vessels "pure music" divinely flowed through rather than as geniuses with bold new ideas)). Shostakovich wouldn't have had a chance 100 years prior.