"He can afford to pitch in," Warren said.
"When your ex needs to go to space about it, you won the divorce," one Twitter user said.
The billionaire’s comments sparked criticism online.
The barrier-breaking pilot was once denied an astronaut career because she's a woman. On Tuesday, she finally fulfilled her lifelong dream.
The billionaire Amazon founder was joined by his brother Mark, aerospace pioneer Wally Funk and 18-year-old Oliver Daemen.
More than 600 people already have spent $250,000 apiece to reserve a spot on the spacecraft.
The Amazon founder will launch into space about two weeks after stepping down as CEO.
The Amazon CEO said he'll be on board the first crewed flight of the New Shepard, a rocket made by his company Blue Origin.
"Our vision is millions of people living and working in space, and New Glenn is a very important step," said Jeff Bezos, unveiling this week his space travel company Blue Origin's giant rocket named after Astronaut John Glenn.
Founder Jeff Bezos hails the launch and landing as "perfect."