Similar kind of thing used to happen with Irish set dancers and Irish ceili dancers at the Camden Irish Centre, I went to both classes for a period of time in the early 90's but I was the only one who did! The set dancing had a big following, about 50 people, but ceili only a dozen or so, I could never understand the apparent division. I think it was a historical thing - ceili dancing went back to the start of the Irish cultural revolution with the formation of the Gaelic Athletic League in the late 1800's and when set dancing underwent a revival in the 1980's, it was considered by the ceili dancers to be a bit of an upstart and not proper Irish dancing although it was originally imported from England with the quadrilles in the early 1800's.