It would be inconsistent, … to hold both that we are free to choose what moral attitudes to take and also that we can demonstrate that an attitude of tolerance is superior to one of intolerance. Furthermore, a little reflection will show that toleration cannot be limitless. If you hold, for example, that fox-hunting is morally perfectly acceptable and I feel that it is cruel and barbaric then I cannot tolerate your hunting without abandoning my attitude.
Aus: David McNaught. Moral Vision. Blackwell Publishing: Oxford/Cambridge 1988.