I don't see how a few manips can be so hurting to people. It's basically a harmless "This is how I'd change his look" comment with a picture to show how. As users above me have said already, it's not worse than bringing up ideas and thoughts in general.
If people want to criticize Apocalypse's look, then they are free to do so. At least manips are constructive criticism rather than just writing "This looks bad".
In my opinion, I don't see why FOX shy away so much from his comic book looks. The marks/scars/whatever on his cheek are iconic to his looks. It's featured here, but looks too toned down for my taste. Also, I think he should have a more grey skin instead of blue. There are so many blue mutants already, we don't need them to make Apocalypse another one. It makes him look a bit generic, even though his costume is very cool.
My main gripe is with his face. He looks too human for being Apocalypse. I think his eyes shouldn't be as human as they are in the pictures, and as I said, the markings on his cheek should be more clearly visible. To me, the look we are presented in the pictures doesn't strike me as Apocalypse to be frankly honest.