"I look at this and I go, 'This is a different environment than the one we've been in.' Brexit is part of the same trend," McNamee said Tuesday in an interview on CNBC's "Squawk Alley." "People are less willing to subsidize those who can contribute to their growth and much more focused on maximizing the share of the pie they get from taxes."
Earlier Tuesday, the European Commission ordered Ireland to recover up to $14.5 billion plus interest in back taxes from Cupertino, California-based Apple. Both the iPhone maker and Ireland are planning on appealing the ruling.
While the current global tax infrastructure is "crazy, ... it exists because we've had a political culture that favored growth and was willing to give tax benefits in order to cause that," McNamee said.
"This is a political problem. It's not going to resolve itself in the stock market. The stock market is just going to react to whatever the outcome is."