Why is Twitch chat so toxic during championships?

Whenever I'm trying to watch any kind of esports, EU and NA are fighting nonstop like kids. It actually really annoys me, but at the same time sometimes chat has good things to say, and it's really hype to see the POGGERS. Is there no way to like prevent messages that contain the word "EU" and "NA" from appearing on my screen? They really ruin the hype and the mood.
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