Streams of gameplay.

Hello, esteemed HW community. I encountered a problem. I was playing against a well-known player, and I won't mention his nickname. When he found out that I was streaming the game and chatting with viewers in the Team Viewer chat, he said, "I won't finish the game; you're not playing fairly by streaming." Then, he called me a cheater for this reason. He said he had no idea that it was possible to create streams and considers it cheating because others are watching and can give hints. He claims that before streaming a game, I should have asked his permission. So, I'm turning to you with this question: is he right? It seems like no one ever asks for permission to stream, and there's nothing unfair about it. But a serious argument erupted, and the player refuses to finish the game and calls me a cheater because I'm using Team Viewer. I'll immediately note that the player is not Russian, Bulgarian, or Polish... but from Western Europe.