This interesting perspective on tolerance is from the novel In Lucia’s Eyes, by Arthur Japin:
[T]olerance is not the same as acceptance. It is actually closer to the opposite: tolerance like this is a clever means of repression. If you accept others as equals, you embrace them unconditionally, now and for ever. But if you let them know that you tolerate them, you suggest in the same breath that they are actually an inconvenience, like a nagging pain or an unpleasant odour you are willing to disregard. Tolerance is a cloaked menace: the mood can change at any moment.