1. The opposing party's opposing the ruling party is a natural process of government. It's the normal state of things. Your saying that it was "poor behavior" implies that it was an anomaly, that the Republicans did something wrong by not supporting everything Obama wanted to do, and that the minority party is supposed to accede to every demand of the ruling party, which would be absurd.
2. The Democrats only controlled Congress for 2 of Obama's 8 years. You imply that, even when Congress is not controlled by the President's own party, that Congress should accede to his demands. This is absurd. It's not how our government works, it's not how it's ever worked, and it's not how it was intended to work--indeed, exactly the opposite is the case.
3. If your implications were true, you should be criticizing the Democrats for doing exactly the same thing right now with far more vehemence.
4. The ostensibly "grassroots supporters" of the current opposition is actually ruthless. Were there violent riots in the streets of cities across the country when Obama was elected?