People like BABD hate "evil is sexy" because they believe that it demonizes female sexuality as a whole.
The bigger question you need to ask is
why BABD still is doing this shit, years later, after the Tumblr exodus, long after everyone stopped caring about that platform.
People like her are used to getting their way just by screeching loudly and hard enough. They've made major inroads in a lot of companies over the years, and you've all seen the result: Media that puts the agenda first and everything else second. But the companies that refuse to conform? Those are the ones they reserve
all of their coping and seething (and, where applicable, dilating) for.
Intelligent video game companies arenever going to uglify the shit out of their sexy female characters and call it progress, but stupid ones will. Intelligent anime creators will continue to appeal to the demographics that pay their bills, but stupid ones won't. The ones that are stupid enough to do this, buying into the hubris, invite their own doom, because the free market will fill in the gaps left behind. People still want this content and people still want to make this content. A few times it may get choked out of the market for a while (as was the case for Senran Kagura), but for every one they successfully stop, another Kamen America arises from the darkness.
It's more than the control, of course: they can't tolerate the existence of characters like this because it holds up a mirror to them that is more than unflattering - it is an utter excoriation of what they stand for. These are people who glorify every vice and human weakness and bitch about every single character design they don't personally approve of. Instead of seeing an attractive character for what it is - an artistic choice, often rich with themes and meaning - they frame it as a symbol of oppression or discrimination without ever truly understanding what they ever stood for in th first place.
I've brought it up time and time again in this thread, but shitters like BABD do not care about authorial intent, character motivation, story reasons, or what the attractive character is meant to emphasize; they instead see a reflection of their own failures: rather than try to better themselves, draw inspiration from he character, or ponder the deeper meaning behind what they were trying to get across, they instead take perverted joy in destroying everything they can about them - bringing everyone down to their level instead of raising themselves up, or going their own way.
The end result of this way of thinking is an excessively small-minded, petty, exceedingly envious worldview, the hallmark of the kind of person who hides their intentions behind a thin veneer of equality and "balance," using it as an excuse to just push their pathetic world-view on everyone else. The universal reveal for the kind of people who push for acceptance of everyone, while at the same time demanding everyone around them lower standards, because that way, BABD doesn't have to strive for anything. Ever.
At the rotten core of it all, this continues due to BABD's insecurity, and that is why watching her flip the fuck out over tits, time and time again, will remain an eternal pleasure.