Full Idea
The anti-realist says we have theories about the world that are incompatible with each other, and irreducible to each other. They often cite wave-particle duality, which postulate incompatible properties to reality.
Clarification
Quantum theory says electrons are both waves and particles
Gist of Idea
Anti-realists say our theories (such as wave-particle duality) give reality incompatible properties
Source
Paul O'Grady (Relativism [2002], Ch.3)
Book Reference
O'Grady,Paul: 'Relativism' [Acumen 2002], p.59
A Reaction
Most physicists, of course, hate this duality, precisely because they can't conceive how the two properties could be real. I say realism comes first, and the theories must try to accommodate that assumption.