It's more about how it only shows girls. No guys, no background images, nothing but girls. Not all anime is objectifying, but if a media depicts only one gender, that'd be a cause for concern. Even if they are 2D, they'd still be female and 3D women are, well, female too.
I can't say anymore about the objectification issue. If you want to know more, you should ask @gemtastic more about it. I think only she can explain it better than I can.
So as long as we can add our own image, we'll be fine, like I said before. I didn't know that the community as a whole can add their own stuff and as l…