The 22-year-old beauty was slammed after she was spotted partying with the 'Batman' star just before he reached-out for help once again.
His estranged wife Jennifer Garner, 45, staged an intervention that led to the father-of-three to get treatment at a private facility.
But Sexton took to her Instagram this weekend to defend herself against any blame for the star's drinking problems.
Replying to another critical user she wrote: I have limitless respect for people who have the humility and maturity to admit when they need to fix something in their life. I have even more respect for those who take action and actually do something about it. With that being said, Ben is a grown ass man, baby. Blaming a 22-year-old for someone's 3rd time in rehab is just ridiculous. He is human. I am human. You are human.We are all ging to f*** up it is just a matter of learning from it. Don't be so quick to throw shade on people. Take a step back. Accept that we are all on our own journey, and be a little less critical. Take care xxx.
It is understood that Affleck, 46, is still receiving treatment to deal with his issues while his girlfriend of the past year Lindsay Shookus, 37, called time on their relationship.
'Peppermint' star Jennifer Garner has stood by her former husband after the couple reportedly finalized their divorce and they continue to do therapy sessions together.
RadarOnline.com recently revealed that Sexton and her family have a criminal history.
We pay for juicy info! Do you have a story for RadarOnline.com? Email us at firstname.lastname@example.org, or call us at (866) ON-RADAR (667-2327) any time, day or night.