WATCH: Brody Jenner Hassled in Public About Caitlyn's Transition

Brody Jenner and Matt Deichl went to a Walgreens in Southern California on Sunday to pick up a pair of reading glasses. Another customer, recognizing the E! celebrity, decided to seize the opportunity harass Jenner about Caitlyn's well-documented transition. Jenner is one of Caitlyn's sons, and she's made it clear she is comfortable with them continuing to call them their father.

Of her relationship with her children, Jenner said in episode 3 of her E! docuseries, I Am Cait, "I want them to be proud of their daddy." She also sent a message to one of her daughters, Kylie Jenner, which she posted on Instagram on Father's Day:

"'You can still call me dad, Kylie. No matter what I'm always going to be your father. That's never going to change.'"

Earlier this year, Jenner opened up about his post-transition relationship with hs famous father, who was known as Bruce before transitioning. "Growing up, I didn't really have the greatest relationship with Bruce. I didn't really see him that often," Jenner said during an interview on the Today show in July. "And Caitlyn is just a much freer person. It's incredible to see the difference between Caitlyn and Bruce. Bruce and I just kind of really didn't get along, to be honest, and [with] Caitlyn it's literally like getting to know... your dad all over again, but in a better way."

Watch below as an unknown woman taunts Jenner about his family in a video he posted to his Instagram account.