Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: I usually bring my Nintendo Switch to my school's lunch room to play Mario kart with some of my friends but there is one guy who I give my controller to play and when I get it back it is covered in a mix of slushy and grease. I told him he may use my controller but I do not want anything on it he said I won't get anything on it and he gave it back to me and what do you know it had stuff on it. I am not letting him use it ever again or until he learns some manners about other people's stuff. Am I an asshole?

not letting my friend use my controller for mario kart