There is genuinely quite a bit of racism coming form the right right now, there always has been but it's been amplified by the election of a black man they view as a non-American "Other."
This is sometimes accurately addressed and criticized, but I think what you're talking about is where it's then also exploited to dismiss legitimate criticisms of the Administration as simple racism.
So because there's a considerable contingent of racists among the right, when those who aren't racist and have grievances with the economy, unemployment, the healthcare mandate, etc. they make clear, they're easier lumped in with the racists than responded to on the merits of their arguments.
It's justified as a response to actual racism, but also utilized as an illegitimate panacea to act as though all criticism of the president stems from racism.
The issue is that perhaps 10% of the Left's complaints of "racism" are factual - which brings us into a "Boy who cried wolf" situation.
Now, legitimate claims of racism are dismissed immediately as "playing the race card".
Actually the true figure is no percent. There are probably no instances where the Left's claim of racism was factual.
OTOH, the Left itself is eaten up with racism. How else to explain that they want to keep Black children in failing inner city schools? How else to explain that they believe Blacks cannot fend for themselves and need constant government assistance? How else to explain that they think Blacks cannot compete successfully and thus need racial quotas and hiring preferences, a generation after Brown v Board of Ed?
The entire Leftist agenda is racist. They try to deflect this by calling conservatives racist. The very opposite is the truth.