But it's understandable to want to know what was wrong with the photo. He's not inviting speculation, he probably just honestly wants to know why that photo is not okay and others are. Honestly, I would like to know the same and I don't think Johnny did a mistake with his remarks.
It would be fine if Yuzuru was the one personally asking to delete the picture, I am sure Johnny would have done it right away without questioning it. But since it's Yuzuru's management, which means people who make decisions about Yuzuru's public image, probably without even talking to Yuzuru about it... I don't know, someone already said in the comments what I am thinking so I am not going to repeat it. In any case, it was his photo and he has every right to vent about it.
(not withstanding that I do not like the guy at all)