First time somebody trolls and rages at me because of my nickname

I feel powerless playing in plat. We all have a good share of bad games and few good games, but there are some matches that make us feel powerless, humiliated and just sad.

Sup, first pick, said in selection: "If I get yuumi we win". Enemy team bans yuumi, then he said: "We are going to lose". He trolls as pyke, I literally told him that he didn't need to troll and that he was sabotaging himself and us because he didn't get yuumi.

Was this offensive somehow? Because then he told me: "Go back to mexico". Although my nickname is in Spanish (and portuguese AND Italian btw), I don't even speak Spanish, hell, even if I did, would that matter?

And no, I'm not really that offended by him saying that, I'm offended because he started trolling hard after that, he walked straight to lux and stood there letting her kill him. We got to a point in the game garen would flash Q + R me and I would insta die (I couldn't get away because of the silence) and I was using Rammus.

After that he told the enemy team I was inting and I should get banned (probably because I told them to report him for racism [because at least he could get some kind of punishment for his feeding since feeding is not against the rules]).

Feeling angry, among other things, in a competitive match is natural and normal. But feeling completely humiliated and powerless is just something that makes me wanna hard quit.

If you are playing ranked games for fun, why don't you just dodge if somebody bans your OTP? Is it fun to troll?

This is the first time somebody feeds because of my nickname (people raged at me before because of it)... I feel like changing it, but I just don't have blue essence enough for that.