Partisanship is what representative government looks like. Imagine a court without a prosecutor and a defense. They just negotiate together and come up with some middle ground. Now imagine that YOU are the one on trial. That's what you get. It may appear peaceful on the surface, but the truth and justice are the biggest losers next to you.
Usually when some group complains about partisanship the goal is to browbeat Republicans to rubberstamp whatever the Democrats want.