[bloak]

Do you know Private Eye (https://en.wikipedia.org/wiki/Private_Eye)? Around the 1980s, presumably shortly after the appearance of Walkman, they had a cartoon in each issue that generally had a scene of several people in a public place with one of them wearing headphones. I think the sound as perceived by other people in the picture was represented by the words "pish pish" but I can't at the moment find any trace of this online. I'm not really answering your question but I suppose that cartoon might help answer your question, if we had an archive of it, which we don't, so not much help really ...