Throughout the NBA, there are a number of well-worn bits used to poke fun, usually lightheartedly, at the visiting teams and their fans. Having someone from the game night staff dress up as a devotee of the opposing team, only to end up getting, say, a pie to the face, is probably the most common trope. Implying that those wearing jerseys of the popular teams and/or players are frontrunners rather than fans is a is a little more mean spirited, but still utilized from time to time.
But arguably the most common of these in-game, at-the-expense-of-the-competition jokes takes place during introductions.