Because it is, all of it load of crap.
In the case of Chris Offili literally.
Bunch of silly perfomances, piles of rubbish and other nonsense for silly people to make a fuss over.
Gone are the days when you made a statue of someone famous, out of marble with a chisle. Now you're more likely to make it out of marvel with a swizzle.
So here's where you can name all the modern and rubbish art.
http://www.mirror.co.uk/news/weird-news/casey-jenkins-vagina-knitting-woman-2864626
That's not art it's just a very silly way to get a cold bottom and an infection.