There is no doubt our navy is the strongest on the planet. But it is foolish to underestimate any foe, particularly one with the monetary and personnel resourcs that the Chinese have. To assert that we are unassailable and never will be, is to invite a lack of vigilance.
We must take what the Chinese are currently doing in their shipyards right now seriously. If the imbalance in development and construction continues, one day we will wake up to a potential surprize similar to Dce 7, 1941.
We can avoid that possibility by doing what we must do to not only maintain our advantage, but by taking steps to undercut and negatively impact the PLAN activities. Right now that would involve painful economic decisions...but that would be less painful than military conflict that may well result if we do not.
See:
I take the Chinese economic/military threat very seriously, most notably their threats against Taiwan. This is precisely why I support a strong US military (I was a submariner in the US Navy so I know the capabilities of our fleet), and that is also why I know the last thing in the world the Chinese want is military conflict with us.