Is there any way for me to disable my own chat in-game?

I started playing again and I remember that this game makes me more of toxic person (generally not in-game, I always used to vent my frustrations audibly), but I was a bit of an ass in an after-game lobby to someone who was also being an ass to me. Any ways or ideas for disabling my chat, or do I just need to retrain myself to refrain from doing this kind of thing?
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