What a fascinatingly false statement. I am amused how you ignore the Liberal Democrat incivility starting with the Bork hearings, the Clarence Thomas hearings, the farcical claims that Bush stole an election, the booing of Bush during his delivery of the 2005 State of the Union and the demogoguery of Democrats against their political opponents in the court of Public opinion.
Why do you suppose that you ignored all that incivility? Got bias and hypocrisy here?
Anyone with even a modicum of intellectual honesty can go back to the Bork hearings and historically see that the party that invests itself in the most outrageous uncivil partisan behavior happens to rest mostly with the Democrat Party.
So my answer is "YES", we are becoming less civil thanks to the efforts of a Party whose Socialist ideals cannot stand on their own and uses the strategy of demoagoguing and impugning the character of their political opponents in the court of public opinion rather than have an honest truthful debate on political ideals, goals and philosophy.
But the notion that your reasoning supports my yes vote would definitely require the willful suspension of disbelief, of truth, of honesty and willful denial.
My favorite speech was this one which pretty much sums up the Hypocrisy of Democrats and Liberals these days:
YouTube - Hillary Clinton - I am Sick & Tired (Right to Protest)