If it's the same writing I'm thinking of I'll try to remember to link it when I get home.

"Tolerance isn't an ideal, it's a contract you're automatically entered into at birth. The contract protects all involved who agree to the contract, but if you break the binds of the contract you are no longer entitled to it's protections. To be intolerant of an intolerant person does not break ones commitment to the contract because the intolerant person is no longer protected by the contract. "

Paraphrased AF