Why would he be ironic? Consuming too many antioxidants have been tested and turn out to have some pretty ugly negative effects, just like too much of anything else at all.
That links to a 2008 Cochrane review.
Here's the updated review: http://summaries.cochrane.org/CD007176/antioxidant-supplemen...
My smoothie is made from whole foods, only.
Supplements are a very complicated thing. I can't even venture to say whether they're good or not, based on all the conflicting information.