What is real tolerance?

I am starting to read Faiths in Conflict: Christian Integrity in a Multicultural World by Vinoth Ramachandra. It is interesting to see how he defines tolerance (p. 121):

To tolerate a belief or practice surely implies
(a) we recognize that belief or practice to be genuinely different from our own
(b) we disagree with the belief (or disapprove of the practice)
(c) we do not coerce or absorb the others into ourselves, but give social or legal space for the other to flourish.

I find it interesting because it acknowledges differences and does not aim to minimise them. Compare, for example, the platitude, "All religions are really about the same thing." Furthermore, it allows public disagreement and debate, while respecting others and their views.

This seems very different from postmodern sensibilities which seem to equate "tolerance" with a demand for the public acknowledgement of the validity of other views.