Were they, though? We don't know what pictures Chad saw. If they were him and Troy, we definitely didn't see them, otherwise this place wouldn't have had such a hard tine believing it when I and several others called him out as gay in the early episodes. It could have been anything. The photos we did see were for Dawe, and some were almost certainly manipulated in some ways.
When he got the pics his first reaction seemed to be anger, which isn't usually how someone would respond if there were 'proof' of their darkest secrets. I suspect it started with some edited pics of Sage & Fuckface, before it moved on to anything that threatened him directly.