The former couple met up to take their daughters -- Violet, 11 and Seraphina, 8 -- out for ice cream at Rori's Artisanal Creamery in Santa Monica, California.
An eyewitness tells ET that Affleck gave Garner a hug and a kiss on the head, however she "looked to not enjoy the PDA."
Affleck seemed to get along well with his daughters as they snacked on ice cream and left with their dad after the get-together. Affleck and Garner, who also share 5-year-old son Samuel, filed for divorce in April after two years of separation.
Affleck tweeted on Tuesday, "I am saddened and angry that a man who I worked with used his position of power to intimidate, sexually harass and manipulate many women over decades… We need to do better at protecting our sisters, friends, co-workers and daughters. We must support those who come forward, condemn this type of behavior when we see it and help ensure there are more women in positions of power."
Following McGowan's accusations, a Twitter user recalled an episode of the MTV show Total Request Live, where Affleck allegedly groped host Hilarie Burton.
"He also grabbed Hilarie Burton’s breasts on TRL once. Everyone forgot though," the Twitter user wrote, to which Burton responded, "I didn't forget."
The 35-year-old actress -- who is currently expecting her second child with husband Jeffrey Dean Morgan -- then tweeted a video of a promo for a TRL special, where she candidly and rather cheerfully seems to be talking about the alleged incident.
"Girls. I'm so impressed with you brave ones," she captioned the clip. "I had to laugh back then so I wouldn't cry. Sending love."
"I would also love to get an apology from Ben Affleck who grabbed my a** at a Golden Globes party in 2014," Tendler alleged in a series of tweets. "He walked by me, cupped my butt and pressed his finger into my crack."
"I guess he tried to play it like he was politely moving me out of the way and oops touched my butt instead of my lower back?" she continued. "Like most women in these situations I didn't say anything but I have thought a lot about what I'd say if I ever saw him again."
On Wednesday, a source close to Affleck told ET, "Ben has done things in the past in jest that could be seen as over the top or inappropriate, but he would never intentionally hurt or harass anyone."