I believe it has to do with how she is posed and the framing of it. For example the 2nd to last panel when they focus on her lower body.Is the complaint how she's drawn? How it's framed? How she's posed?
https://www.bleedingcool.com/2019/01/03/killing-joke-barbara-gordon-batgirl-page-heroes-in-crisis-4/
That's the article that I was reading.But some found the scene too focused on Batgirl's body, sexually exploitative, taking the male gaze for something meant to be disturbing rather than something fun and/or sexual. Focusing on the character's sexual attributes, boob socks in her costume and rising up at the back, body paint rather than anything protective. And, combined with her bullet wound, creeping loads of folk out.
The costume under the spoiler is OK. Biggest issue of the comic page is the framing of the shots. What's right smack-dab in the middle of every frame? T&A. Gah.
My question is how should they have shown her wounds? As the bullet wound is where it its. I can understand the 2nd to last panel tho, I suppose they didn't need to show her standing up and focusing on her lower body.