Democrats have been gerrymandering for decades [0] [1] [2]. It's only when Republicans started doing the same did it suddenly become an issue of great ethical concern to many Democrats. I recall with vivid clarity the now disgraced ex-con [3] and former Speaker of the N.C House, Jim Black declared that he didn't see anything wrong with injecting politics into drawing districts. Don't fall for their phony outrage and moralizing.
[0] https://en.wikipedia.org/wiki/North_Carolina%27s_12th_congre...
[1] https://en.wikipedia.org/wiki/North_Carolina%27s_12th_congre...
[2] https://www.nccivitas.org/2016/a-look-back-sheds-light-on-re...
[3] https://en.wikipedia.org/wiki/James_B._Black