False Reported?

I was playing classic just now and at the hero pick, a teammate chose minsitthar as offlane so I picked helcurt as roam. When the game starts, he switched to roam before I noticed and there’s 3 of us in the gold lane. So I told him “Minsitthar offlane twr ly”. Which roughly translates to “Minsitthar, go to offlane”. He didn’t say anything and kept roaming so I cancelled my roam (which cost 100 gold) and just switched to offlane.

Around mid-game, enemy Aamon started (I assume) Trash talking. I can’t see the chat because I’m using an Iphone and my (also his) native font is not visible to me. Why I assumed he was trash talking is because he wrote something eveytime he was killed by me. And later in the game, one of my teammates started to trash talked back to him.

After, in the match settlement, I got a rule violation: inappropriate chatting under that stats (I forgot to take a screenshot but I think most of you guys will know)

I’m unclear if it means it’s reported by someone or system detection. Either way I don’t see anything inappropriate.

That’s nothing important but I want to know why did I got that.