In American parlance, trash talk refers to a member or supporter of a sports team bragging about their prowess and insulting the opponent. The Number 1 gesture above is a mild example. It's everywhere, it's accepted, even if it is a bit juvenile. Oh, and although it's not exactly about sports, Donald Trump is another example.
Ballpark Village is a restaurant-bar-entertainment venue across the street from the stadium. Nice for fans, although it drove some of the older restaurants in the neighborhood out of business. I don't like this Cardinals Nation meme, though. You see it in a number of contexts but especially sports. I think the term originated with modern references to Native American societies. Navajo Nation. Cherokee Nation. Those are nations. Cardinals Nation is a marketing fiction.
And as I said yesterday, we welcome supporters of opposing teams, even the biggest Cubs fans.