If OP shared the image in such a way that other people on PSN could see the image without any kind of warning, then their suspension was entirely justified. The fact that this is in the game to begin with is irrelevant.
Although I can see the game being recalled for this, as this is the kind of thing that warrants an AO rating, and patching it out isn't sufficient, as that doesn't change the fact that the content is on the disc. Not everybody downloads patches. This is Hot Coffee all over again.
Didn't GTA v have cocks in it?