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As far as I understand it this is not a fight against sexualization but a fight against objectification. There's a difference between the two and a youtuber I follow made a pretty good video about that: https://www.youtube.com/watch?v=rx6cSMsX6V0
In short, it's okay to find women sexy, it's not okay to think women exist for you to find them sexy.

However I think the main problem I see with objectification in art is not that it happens but more so that it perhaps happens too much. It's difficult to find works of fiction with multiple interesting female characters that aren't there just for the audience to look at or for the male protagonist to fall in love with. Stories affect us (to a point) and if we never see women in stories who are treated as humans with their own opinions and ideas then obviously there will be people who believe that to be the truth.

I didn't read the whole thread as I kinda found the walls of text intimidating but I'm assuming that debbie is trying to point out that in anime/manga there's always the same pattern on how women are shown and treated and that it can have harmful consequences on how women are seen and treated in real life.