No to negativity!

I know he's my friend and all but he is just way too negative for me. Like he's the annoying negative. I can't stand it. He's like killing my mood right now. I want to go home but we didn't even eat yet. Like seriously though. I don't like his personality anymore. Ugh idk dude. I just don't want to hang around him anymore. How do I break it to him? Or do I just leave it alone?