I wonder if musical instruments observe the class boundaries.

Do the Martins and the Lowdens get together in secret groups and say - we don't want those nasty Yamaha oiks making their beastly strumming noises, whilst we are expressing ourselves in faultless musicality?

I don't know about that WLD, but sometimes their owners do just that. I've seen "instrument snobbery" many times in 40 years of sessioneering and gigging.

On the main subject, I play and sing what I like where and when I like and rely on an inbuilt sense of what is appropriate for a given situation.

RS (ex-Martin and Lowden owner, now very happily playing a Yamaha)