Riot and toxic guys in the community

I dont have any screenshots or anything of what happened in this game but heres the short breakdown of it,whether or not you wanna take my word for this game I dont care.

-Two guys duo into a normal game,me and my friend whos the ADC, i'm olaf and hes Sivr -Two other guys duo and one solo ques it, solo being the kat mid,and a teemo jgl and fiddle support duoing.

• I get camped top and lose lane because of it and struggle to get back on my feet as olaf falls off if behind. -Teemo gets his ass beat by a vayne jgl who ends up carrying the game and stomping everryone out. -Kat mid loses but I believe ends up coming back in the game
• Bot lane kinda goes even with each other. Dont get me wrong I did bad,and was a little toxic but essentially what happened was teemo had came top for no reason at one point because he was behind,and started taking minions and was pushing to tower with me, I had pinged him back but he stayed,and we got ganked and both died. I asked him why he was up there and to which he started flaming me calling me a noob over and over,and calling himself the carry of the game. I had kinda just passed it up and kept playing to which I got ganked 2 or 3 more times in laning phase and just decided to start taking jgl farm since he was 4 levels behind and I decided he wouldn't do much with it anyway. After each gank that got me killed,he'd call me a noob,become a keyboard warrior for about a minute,and then proclaim himself the carry and that he was the best in the game. He would flame me since I had no kills and said that his 1 kill over me showed how much of a better player he was. Fastforward and he would continue flaming me,I got back into the game with a few kills and assist and had made some plays in a few team fights which helped us. After getting more kills then me he would then flame me for "not having enough assists" and that I wasn't "a team player" therefore I wasn't as good as him. I'll admit I lost my temper a few times in the game and had called him a r%%%%% a few times,but it was only twice at most and it wasn't like anything L9 levels of toxic. At one point he started running it down quite literally and was splitpushing nonstop,just right clicking turrets and dying. Once he died bot lane while I split top and got two turrets,to which he flamed me for his death bot lane as the whole team collapsed on him. Long story short eventually fiddle jumped in,teemo kept being narcissistic,flaming,proclaiming himself as the carry,and then inting. The last extent of me typing was me telling him that he should stop playing and that I was genuinely concerned for his wellbeing as he was getting so mad over a game. My point is this
• Why did I get a 10 day chat restriction and this guy and his duo dont get a ban? Personally I dont think the 10 day chat restriction was fair ,but I can live with it. What I cant live with is the fact that a guy whos actually running it down gets no punishment despite the guy whos just trying to play the game and have fun gets a chat restriction.

This is pretty much just a vent post and just wanted to share a story, so I dont really expect much meaningful feedback. I just want to know how stuff like this happens.