Hot take :
If Im-sama turned out to be
Female, competent and Strong then I'd argue there's no sexism in OP
Oda will never let it happen tbh.
If Imu is female, Oda will make her have such a broken DF, it let her gain supreme power over the world by it. Similar to Kaguya, they will be "unbeatable" but Usopp, the counter specialist of women with broken as hell DFs will come in and take out Imu with some clever trick instead and maybe become King of the World lmao.
Oda won't even let us have a female Admiral nor a new female Yonko and Boa had to be saved by Rayleigh too. Smoothie has disappeared into the void. Compote who? Hiyori was just a damsel with no combat ability/training. Kiku is biologically male and Yamato is meant to be a man instead, especially as a lot of her fans insist too. Big Mom is the biggest female clown, making Alvida look irrelevant by comparison too.
Plus we saw how much Oda shat on Carrot too ofc.
Also wasted Viola, Reiju, Baby 5 too. Giolla was just a gag character with a broken power. That factory manager only existed to get kissed by Franky in one of the weirdest, most uncomfortable scenes.
Saika Magoichi is magificently written and it makes Oda's writing so laughable by comparison. Capcom loves writing strong women, well them and their partner studios/developers lol. Jill Valentine the goat for example too!