To come across a session if you have never encountered folk music and song before is a good way to become aware of the genre.
If you are really interested you would find out where you can encounter more of it.
By visiting a folk club you would then decide which approach to the music you preffered ie the formal concert folk club, or the informal session.
Either way you have found a new interest.
The club versus session arguement is no diffent to the catholic v protestant arguement, which ever you preffer you are still a folk fan or a Christian.
A little less intolerance is required, folk music is what ever you like it to be.
Some people seem to think their prefference is the only true way