Am I in the wrong or is my sister?

So earlier today, I was having a cookout at my sisters house let’s just call her Kate. There was four kids there. 2 twins and 2 babies. After I was finished eating my food, I started chewing on a plastic spoon. I broke a few pieces off and left them on the edge to go get a drink. When I came back Kate was yelling at me abt how I left a broken spoon there. So I threw it away. I accidentally left the other half of the spoon there, so after I left, Kate called my mom and told her to ground me for a month and started to go off on me abt how I’m irresponsible and lazy. Who’s in the wrong? Me or kate?