Should I tell my friend not to shoot rats with a bb gun?

My friend sent me a photo of a rat caught in a trap in a tree at his house. At least that's what it looked like. Then he was like "time to get my bb gun they like to go on the BBQ". Im pretty sure he was serious because when we were younger, he shot and killed a rat. Im worried because I know its inhumane to shoot a rat with a bb gun, because it doesn't have enough power. Im afraid that If I tell him not to, the he'd get mad at me, so id rather keep my mouth shut, but I'd feel kinda bad. I dont even know what to say.

Should I tell my friend not to shoot rats with a bb gun?
Post Opinion