Quackery they could tolerate. But how dare he question the nutritious yummy GMOs whose manufacturers are pumping millions of dollars into endowments for those other Columbia University medical faculty. While he's enriching himself, those poor souls may lose out on lucrative $$$. Can't have that.
(That's not to say dr. Oz is not a quack - he certainly is a snake oil salesman, but these guys have an agenda that's as clear as day)
Rather Dr. Oz has an agenda in spinning his response so it looks like his accusers have an agenda.
Police: Joe robbed a grocery store last week and shot five people this week!
Joe: It's not fair to say I robbed the grocery store. The owner was greedy and ripping people off!