Putting aside the Half-time show, The argument against watching sports is Bittual torah, not Prizus (Many football teams do not have cheerleaders (The big teams like the Giants, Packers, Steelers and Patriots do NOT have cheerleaders ) and the half time show is not shown on tv
And if you go to other sports like Baseball , hockey or Basketball there are no cheerleaders (I dont think soccer has either) Its all about the Bittual Torah