Liz Phair has written songs about divorce before.
This, the first single from her new album Soberish, her first album in over a decade, is nuanced and layered and beautiful. Anyone who has been through divorce, or any breakup, can relate to the feeling of wanting to be alone and just hiding in the bathroom. This song illustrates that in such a artful way.
Contrast that with an also excellent, but less beautiful and more gritty, song from her 1993 debut album Exile In Guyville, and the Girlysound tapes before that. In 2016, she called this one of her favorite songs, and I agree. It's sad, and dark, but also jangly and hard not to relate to.