Is OTHER wrong in the post ? POST : I don’t know where to start exactly because I want make this unbiased as possible to get a reasonable feedback. Here I go.. I work as a tutor in a small academy and watch over kindergarteners to 8th graders. Watching 8th grade is a bit challenging(Anyone who works with teenagers will know). Even though it’s challenging I’m able to stick through it because I know what it feels like to be their age with their problems so I try to stay that lay-back teacher. However teenagers have no social awareness and will take advantage of that. So it’s challenging to balance between chill and authoritative. With this in hand I like to think the kids and I have good(?) relationship. 
Anyways there is this kid let’s call him Eric. Eric has a tendency to do whatever he wants. I actually talked to him about it and he admitted that he has this fault. Today he was playing a typing test on the laptop even though the laptop is only strictly for Homework. Honestly I wouldn’t mind him playing secretively (what I don’t know wont hurt me). However Eric doesn’t care for this. He’s the i will play right in-front of your face type of guy. When I ask him he tells me that he finished all his homework and that I should let him play this. I told Eric to get off but he doesn’t listen. I just stare at him telling him to stop playing for 3 minutes but he continues to play and gives me all these reason why he should be able to play.

This continues and he then gets annoyed at me and leaves to a different classroom. A few minutes later I hear him arguing and trying to persuade another teacher why he should be able to play this game. This triggers me and I go over to him and I see him playing the game once again. I then shut off the computer and told him “I already told you not to play this game and you’re starting to piss me off” He then says something in the line of I should mind my own business. 
I got bit heated cause of that comment so I told him that he’s about to cross the line and he then gets quiet. 

And thats the story. There’s a lot of things going through my head but I just want an opinion on if I am being an asshole or not