Would I be a bad person for not contronting my friends brother about taking photos of girls without permission?

I don't know his brother well. I met him maybe twice. He seems kinds like a dick honestly. The first time I met his brother Like 6 years ago was at my friend's birthday in a restaurant. I introduced myself, and he just gave me a quiet "hey". The second time I met him was several months ago at a fair. He was playing a game on his phone. My friend and I walked up to him. My fiend was like "hey, I don't know if you remember my fiend nick or not" he put up one finger, indicating that he was busy. We just stood there for a few seconds in silence while he played his game. He was just gave me a quiet "hey buddy". Anyways, a couple months ago my friends brother whent to a concert. I guess he took a picture of a girl's butt with booty shorts on or soemthing, and he sent it to my friend. I tolld my friend that it's creepy. He agreed. I havnt said anything to His brother. I'm afraid to because I'm afraid he'd get angry, and I'll probably see him again. Or he might tell my friend what I said, and it could effect our friendship.

Would I be a bad person for not contronting my friends brother about taking photos of girls without permission?
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