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I (26m) take tennis pretty serous. Im not a pro or anything but I play alot and I hate when people just mess around and dont follow the rules. It just ruins the game.

Last weekend my brother Dave (34m) and his kid Leo (12m) came over. Leo started taking tennis lessons like 6 months ago. He made his middle school team and wouldnt shut up about it. He kept bragging and saying stuff like I could probaly beat you now and bragging about his topspin.

Dave said we should go to the local courts so Leo could show off. I said fine lets play a real best out of 3 sets match.

Even in the warmup I could see Leo was way to cocky. His form was trash and he was just getting lucky. When we started I decided Im not gonna take it easy on him. If you talk big you gotta play a real match.

First game Leo is serving. On his second serve his shoe touched the white line before he hit the ball.

I called it right away. Foot fault. Double fault my point.

Leo looked confused and said he barely touched it. I told him a fault is a fault and in a real tournament you lose the point. Dave laughed from the bench and said come on man give him a break its just for fun.

I told Dave letting him cheat dosent help him learn anything.

So I just played my normal game. I hit my serves full speed and did drop shots making him run all over. I won the first set 6 to 0. By the second set Leo was super red and panting and getting mad.

At 4 to 0 in the second set Leo hit a crazy forehand down the line. It was close but from where I was standing it was definately out by a tiny bit.

I called it out. 15 love.

Leo dropped his racket and yelled that it was on the line and I was lying.

I walked to the net and said arguing with the caller is a code violation. I told him his sportsmanship sucked and in a real match he would get a penalty for yelling like that.

Leo started crying hard. He threw his racket at the fence and just sat down crying. Dave ran on the court and got in my face saying I was a huge jerk. He said I ruined Leos confidence and ruined the whole weekend just to boost my ego agianst a kid.

They packed up and went back to their hotel. We havent talked since but Dave texted me calling me a try hard loser.

I honstly dont think I did anything wrong. He wanted to be treated like a real player so I did. I dont make the rules I just play by them. Aita?

Edit: Ok I read all the comments and I see why I am the ahole now. I called Dave and Leo and said sorry for ruining the weekend and making him cry. I should of just let him have fun. I just wanted to add that I am autistic and sometimes my brain just gets stuck on following the exact rules and I really struggle to read the room when people are just trying to chill. I didnt mean to be a jerk I just really didnt get it in the moment. ima do better next time.