Sometimes this can work: sneer at them for NOT liking folk music, declare that it's "cool" or whatever the most "awesome", "groovy", "wicked", "far out", "wacky", "cool" term you can use is, and then keep going on about how "it is SO THE BEST, and you CAN'T BELIEVE that they are SOOOOOO not "with it" to not like it!!!!!!!!!!"

Pretend that you alone know what is cool and if they don't agree with you, then they are uncool. Then let them hear some of te stuff, explain about it. Tell about meeting one of your heroes or something... let them know, that it's cool BECAUSE it's not on MTV, and people who like it, do so because it's good, not because billions have been spent on advertising.

You have to have a certain force of personality to carry it off, though, or you will get shunned.

But if you are shunned, then they are probably not true friends to you anyway.