Why is it that the people who complain about everything being too politically correct, get offended when minorities call them racist?

It usually goes like this,

person A: "Society is becoming too PC."

Person B: "Then why don't we discuss racism."

Person A: "I don't want to discuss racism, I just think black people whine too much about racism."

Person B: "You do realize what you said was racist."

Person A: "How dare you call me a racist!, Lincoln freed the slaves and reparations were already paid; you are not getting my tax money!!!

Person B: "I did not even mention reparations and slavery, so what you said again is racist."

Person A: "I am done with this, you are being too PC."

Why is it that the people who complain about everything being too politically correct, get offended when minorities call them racist?
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