That's making the assumption that they stop watching when your national team is not playing, which hasn't been the case here.

Also, as stated, even if you love sports, if I were to turn on something like Die Hard and cheer at the screen every few minutes when Bruce Willis does something awesome, or play a video game and yell profanities because I died, people would (rightly) think I'm a jerk and distracting everyone. Even if I only did once every four years.