It sounds like non-musicians having fun on each others borrowed instruments; either that or it's a cynical attempt at faking weirdness for its own sake. As an experimental / free improviser I tend to take things rather more seriously in terms of resonance and technique, which doesn't preclude rough edges & a certain naivity, God forbid, just maximising on the sonic potential of this thing called music which takes a lot of hard work & chops. It's mistaken to say anyone can play like this without putting the work in, just as it's mistaken to think anyone can paint like Picasso at his most primitive; some of the most awesome & technically accomplished musicians I know are free-improvisers. Sadly, this just sounds like people who can't play.

Remember the Third Ear Band? They did the most far out folky weird free improv and were some of the most amazing musicians on the planet as this brief clip proves.

http://www.youtube.com/watch?v=h1XrbbIV-g8

Maybe the Tradition of this sort of thing passed long ago?