So is trashtalking a offense?What is this preschool?

No, it's a competitive game where sportsmanship is expected, and unsportsmanlike behaviour can be punished... like in pretty much every competitive sport there is.

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I mean we're all adults here.

Yeah, you're right. Mature adults, so talk like one. Or else, getting banned is an easier solution for you.

Then act like one? o.O

It's not exactly difficult.