Sounds like you both handled it horribly. Good job.

It's the result of verbal harassment. This is a game, you play it for fun. When you're harassed, you stop having fun.

So, naturally, you'd stop playing. TC shouldn't be banned.

Don't waste time explaining anything. Here are the 2 best ways to combat trolls:

1: Be ridiculously nice. To everyone both on your team and on their team. The only thing people look at after that is Garen being a ******bag. You will never be looked upon negatively unless the entire game is comprised of trolls. This is countertrolling through kindness.

2: Make up a ludicrously insane argument. While he is having his argument, have your own. If he tells you to stop feeding and that you are a ******/noob, tell him to return your dog or you will alert the authorities. If he persists, keep going. Make it even more audacious and crazy. Describe the dog, state your demands, etc. Eventually his blood will boil. This is countertrolling through insanity.

Or you could just, ignore it and keep playing. If he keeps typing, he's the one that will have more downtime and look like the short bus rider.

I've probably been reported 2173981879283942 times. Riot uses humans to do the banning, so they dont often ban for reasons that are odd like yours

It takes a lot of reports to actually get banned. I reported some guy who was harassing me really bad and Riot did nothing about it. He was saying things like " you don't know who you're dealing with, I know people at Riot.... blah blah blah I'll get YOU banned" I thought reporting that guy would be an automatic ban, but they never did anything about it. I checked the guy's profile for a while and he still logs games every day.

So ya, I wouldn't worry too much about being banned from one report. It seems like it takes a lot of them to add up to a ban.