The Red Hot Chili Peppers are not just the worst band in history, but this ranking includes every last bar band, song poem, and demo tape. Any 14 year old's basement metal band is better. Earl Jam is better. People singing around the campfire is better. They are also the "worst" band in history, by which I mean morally, and this ranking includes Burzum, R. Kelly, and Charles Manson. Their music is so bad that it is actually sinful for them to make it.
So sure, you might have an individual song here or there that is worse. But I'll take Neil Diamond over RHCP any day.