[4] Her father was a musician who toured with bands including War and Ambrosia, and her mother was an actor in commercials and a fashion designer.

[5] When asked about what music spoke to her in her youth, Cosentino mentioned Linda Ronstadt, Rilo Kiley, Sheryl Crow, Stevie Nicks, Joni Mitchell, Gwen Stefani, and No Doubt.

[15] On May 14, 2018, Cosentino released a single, "Jerry (Maybe We Should Get Married)", which was a collaboration with songwriter Nick Lutsko and parody Twitter account @Seinfeld2000.

[16] The song, released by the company Super Deluxe, features Cosentino singing from the perspective of Seinfeld character Elaine Benes.

[16] On February 11, 2021, Spotify launched the show Bandsplain with theme music composed by Cosentino and Jennifer Clavin of Bleached.

[6] Designed for the company's Urban Renewal vintage clothing brand, Cosentino's inspirations for the designs included the movies Clueless and The Craft, Stevie Nicks's "infamous witchy style", and her childhood in the San Fernando Valley, describing it overall as "if Stevie Nicks and Cher from Clueless had a baby and they took her to a séance.

[28] In the piece, Cosentino called Weinstein "The Man With Power Who Abuses It", and discussed how men like that are "in colleges, at Halloween parties, at car washes, in grocery stores — they're everywhere.

[26] Cosentino had previously appeared on The Daily Show in 2016 to discuss sexual assault in the music industry after Dirty Projectors' Amber Coffman and other women publicly accused publicist Heathcliff Berru of sexual misconduct, which Cosentino had responded to supportively.

[29] On March 25, 2020, Cosentino debuted her weekly radio show Bethline, livestreamed on Best Coast's YouTube channel.

[30] Subsequent guests of the show included Sleigh Bells's Alexis Krauss,[31] Paramore's Hayley Williams,[31] Vanessa Carlton,[31][32] Soccer Mommy,[32] and Fred Savage.

[33] On June 23, 2023, Cosentino's boyfriend proposed to her in a parking lot of the Americana at Brand shopping mall in Glendale, California.

[39] Snacks appeared on the covers of Best Coast's debut album Crazy for You and Wavves's King of the Beach,[39] featured in a PETA advertisement with Cosentino,[40] and had a dedicated Twitter account.