[jmcgough]

I didn't get the impression that she wanted a safe space, just that she was criticizing design decisions.

"The problem is that you can't prevent a stranger from sending you something you don't like"

Sure, but Instagram could choose not to automatically display images from strangers. Because of their design, she can't check messages that she wants without possibly seeing a stranger's dick. That, and there's no easy way for her to report them for that message.