I don't find it annoying to battle UU, NU, BL teams in wi fi, in fact, they're interesting for me, sometimes they have such nice strategiesthat can easily win against OU teams.
Skilled people win with their favorites.. It's not important for them if their pokemon are in the NU, UU or BL tiers. I have teams which have pokemon from UU, NU, BL and even OU all in one party. I choose the pokemon i like and teach them the attacks i want them to have. I do take a look in Smogon's Strategy pokedex to come up with ideas, but i don't follow their strategies, i adapt my pokemon according to my team. I admit i have an Uber team, because i like using legendaries, and i enjoy having some Ubers battles.
I think people should use what they like and battle as they like. They don't need to follow smogon strategies to win, because i think battling is for fun and enjoyment, and smogon sets are all focused ONLY on winning and nothing else. That's why i don't like following their strategies. I battle for enjoyment and i don't care if i lose.